TTNC-102-2
Maintenance Manual
1) Before using the Rotary Table, we recommend
you to read this Manual thoroughly.
Keep this Manual in an easily accessible place so
that you can read it anytime necessary.
(M)TTNC102-2-9-16AE
June, 2016
Contents
Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
Auxiliary Work Accompanying Maintenance Work . . . . . . . . . . . . . . .
2
General Structure of the Rotary Table. . . . . . . . . . . . . . . . . . . . . . . . .
4
Supplying and Replacing Lubricant . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
Mounting and Dismounting the Motor Cover Section
for the Rotating Axis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
Mounting and Dismounting the Motor Cover Section
for the Tilting Axis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12
Mounting and Dismounting the Cable Connector Section . . . . . . . . . .
16
Connecting and Disconnecting the Piping . . . . . . . . . . . . . . . . . . . . . .
18
Mounting and Dismounting the LS Case Cover
of the Tilting Axis Drive Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
Mounting and Dismounting the Side Cover (A) . . . . . . . . . . . . . . . . . .
20
Mounting and Dismounting the Side Cover (B) Section . . . . . . . . . . .
21
Replacing the Limit Switch for the Clamp Confirmation Unit
for the Rotating Axis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
Replacing the Clamp Confirmation Unit for the Tilting Axis . . . . . . . . .
24
Replacing the Solenoid Valve for the Rotating Axis . . . . . . . . . . . . . .
26
Replacing the Solenoid Valve for the Tilting Axis . . . . . . . . . . . . . . . .
28
Replacing the Proximity Switch of the ZRN Deceleration Signal Unit
for the Rotating Axis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
32
Adjusting the ZRN Dog Position for the Rotating Axis. . . . . . . . . . . . .
34
Replacing the Proximity Switch of the ZRN Deceleration Signal Unit
for the Tilting Axis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
36
Adjusting the ZRN Dog Position for the Tilting Axis. . . . . . . . . . . . . . .
38
Replacing the Limit Switch for the Overtravel Prevention Unit
for the Tilting Axis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
40
Adjusting the Deceleration Dog Position for the Tilting Axis . . . . . . . .
42
Mounting and Dismounting the Motor for the Rotating Axis . . . . . . . .
44
Mounting and Dismounting the Motor for the Tilting Axis . . . . . . . . . .
48
Measuring Worm Gear Backlash. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
52
Adjusting Worm Gear Backlash of the Rotary Table
for the Rotating Axis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
56
Aligning Phase between the First Spindle and the Second Spindle
of the Rotary Table for the Rotating Axis. . . . . . . . . . . . . . . . . . . . . . .
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Adjusting Worm Gear Backlash for the Tilting Axis . . . . . . . . . . . . . . . 64
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Foreword
Strictly observe the following conditions when carrying out maintenance work of the Rotary
Table.
1) When conducting maintenance work of the Rotary Table, refer to four instruction manuals
listed below:
Safety Instructions and Recommendations
This instruction manual describes the safety instructions to be followed when installing,
operating, and conducting maintenance work of the Rotary Table.
As a supplement, recommendations for the use of the Rotary Table as well as a glossary
of terms used in the instruction manuals are included.
Setup Manual
This instruction manual describes prerequisites for installation of the Rotary Table on the
machine tool, and troubleshooting.
Maintenance Manual
This instruction manual describes maintenance work associated with adjustment or
replacement of major components of the standard Rotary Table.
Supplementary Manual
This instruction manual describes the additional specification or maintenance work
required for the modification added to the standard Rotary Table.This manual will not be
provided when there is no addition or modification.
 Maintenance Manual and Supplementary Manual are intended for maintenance personnel.
Maintenance personnel must have appropriate skills and qualifications for maintenance
work.
(Maintenance personnel must be graduated from a vocational training school or receive
education or training in maintenance at your company.)
 Operators of transport equipment associated with maintenance work must be qualified
personnel with the appropriate license for such equipment.
2) Before carrying out necessary work, carefully read these instruction manuals as well as the
machine tool instruction manual and thoroughly understand all procedures and instructions
to be followed.
 Be sure to understand the structure of the machine tool and the Rotary Table before
commencing the work.
If you have any questions about the description in this Manual, or if you find any serious
problem or trouble, contact TSUDAKOMA for detailed information.
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Auxiliary Work Accompanying Maintenance Work
For the maintenance work of the Rotary Table, not only safety measures but also an auxiliary
work is required before starting and after finishing the work.Follow the procedure below to
conduct the auxiliary work to accompany the maintenance work.
[Instructions]
1) Closely follow the instructions described in "Safety Instructions and
Recommendations".
2) Turn off the power (primary power) to the control unit of the machine tool.
3) Stop supplying working fluid pressure and release residual pressure from the working fluid
piping.
4) Disconnect interface cables between the Rotary Table and the control unit of the machine
tool.
5) Disconnect working fluid piping from the Rotary Table, and cover the terminal of each pipe.
 Put match marks at the mounting positions of working fluid pipes for reassembly with a felt
pen.
 When the Rotary Table needs to be operated temporarily for the maintenance work,
working fluid could gush out from working fluid piping during the operation. To assure your
own safety, cover the end of each pipe or shut off the supply of working fluid pressure.
6) Dismount the Rotary Table from the machine tool and place it on an appropriate work
bench.
 Dismount the Rotary Table from the machine tool referring to the machine tool instruction
manual, the Outline Drawing and Setup Manual.
7) Conduct the desired maintenance work.
 When conducting maintenance work of the Rotary Table, refer to Safety Instructions and
Recommendations, Setup Manual, as well as Maintenance Manual.
8) Clean the Rotary Table and the machine tool.
9) Mount the Rotary Table on the machine tool.
 Install the Rotary Table to the machine tool referring to the machine tool instruction manual,
the Outline Drawing and Setup Manual.
10) Connect the working fluid piping to the Rotary Table.
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11) Connect interface cables between the Rotary Table and the control unit of the machine
tool.
12) Carry out trial run of the Rotary Table referring to "Trial Run" in the Setup Manual.
13) Check that every attachment operates correctly, following the instructions described in the
machine tool instruction manual.
According to the instructions, the Rotary Table needs to be dismounted from the machine tool
before commencing maintenance work. However, if it is difficult to dismount the Rotary Table
from the machine tool or if the maintenance work can only be performed properly with the
Rotary Table mounted on the machine tool, conduct maintenance work of the Rotary Table
without dismounting it from the machine tool.Ensure the safe working environment in the same
way as the case where the Rotary Table is dismounted.
1) Never conduct maintenance work unless the safe working environment is
ensured.
 Any work under unsafe working environment may pose a danger to operators.
1) When operating the Rotary Table during maintenance work, take necessary
steps to prevent working fluid from gushing out from each pipeline or working
fluid piping in the designated frame of the Rotary Table.
 When the power to the control unit is turned on without taking the preventive steps,
working fluid will gush out from each pipeline or working fluid piping. This might cause
an accident to the operator, resulting in death or severe injury. If working fluid gushes
out, the gushing may cause parts or tools to fly off, resulting in damage to the Rotary
Table or the machine tool.
2) Connect and disconnect working fluid piping and interface cables according to
the instructions in the machine tool instruction manual.
 Improper connection of any working fluid piping or interface cable not only could cause
a malfunction of the Rotary Table but also pose a danger to workers and operators.
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General Structure of the Rotary Table
Structure of the Rotary Table for the Rotating Axis
ZRN deceleration
signal unit
Motor
Pinion gear
(For the rotating axis)
Spur gear
Gear engagement section
Main body frame
Worm wheel
(First spindle)
Worm spindle
(First spindle)
Worm spindle holder
(First spindle)
Coupling
Connecting shaft
Coupling
Worm wheel
(Second spindle)
Worm spindle
(Second spindle)
Worm spindle holder
(Second spindle)
The figure above shows the outline drawing of the drive section of the Rotary Table for the
rotating axis.
The drive section consists of a motor, the gear engagement section and two worm gear
sections (each including a worm spindle and a worm wheel). The worm spindles of the first
spindle and the second spindle are connected via a coupling for integration.
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Bearing
Main spindle
Worm gear
Rear cover
The figure above shows the structure of the main spindle section of the Rotary Table for the
rotating axis.
The Rotary Table for the rotating axis has two main spindles, each of which is equipped with a
worm gear.
The force transferred from the drive section is conveyed to the main spindle via the worm gear.
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Structure of the Tilting Axis Drive Section
Motor cover
Quick exhaust
Solenoid valve
Clamp confirmation unit
ZRN deceleration signal unit
Main body frame
Motor
(For the tilting axis)
Pinion gear
Spur gear
Gear engagement
section
Worm spindle holder
The figure above shows the structure of the tilting axis drive section.
The drive section consists of a motor, gear engagement section, and worm gear section
(including a worm spindle and a worm wheel).
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Main spindle
Main body frame
Bearing
Worm gear
(Worm wheel)
LS case
Overtravel
prevention unit
Limit switch
Deceleration dog
The figure above shows the structure of the main spindle section of the tilting axis drive section.
The force transferred from the drive section is conveyed to the main spindle via the worm gear.
The overtravel prevention unit is provided inside the LS case.
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Supplying and Replacing Lubricant
Lubricant feed port
Lubricant feed port
Lubricant drain port
Lubricant drain port
Cap
Plug
Dedicated sealing material
O-ring
Check the lubricant feed port, lubricant drain port, and the oil gauge location with the instruction
plate on the Rotary Table and the Outline Drawing attached to the Rotary Table instruction
manuals.
In the instructions, lubricant supply and drain operations are explained at the same time. Select
the required steps from the instructions according to the operation you need.
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Clean around the lubricant feed port of the Rotary Table.
3) Remove the cap or plug when supplying or draining lubricant, and supply or replace
lubricant.
Set the dedicated sealing material or O-ring to the cap before tightening the cap.Set the
sealing material to the plug before tightening the plug.
 Refer to "Supplying and Replacing Lubricant" in the Setup Manual, and supply
lubricant until the lubricant level reaches the appropriate range on the oil gauge.
 For details about the caps, O-rings, and plugs, refer to "Parts List" (P-68).
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Lubricant Amount Required for Entire Replacement
Rotary Table for
the rotating axis
Rotary Table for
the tilting axis
Amount of lubricant
Approx. 0.8 lit.
Approx. 0.3 lit.
Viscosity grade
VG100
VG100
Support tail
Maintenance free
(No lubrication required)
 The amount of oil in the table is the one for the standard specifications. If the amount of
oil specified in the table above differs from that for the delivered Rotary Table due to an
addition or changes to the specifications, write down the actual amount of oil in this Manual
and the Rotary Table Inspection Procedure.
 For details about the lubricant standard, refer to "Supplying and Replacing Lubricant"
in the Setup Manual.
1) When the lubricant level in the Rotary Table is not in the specified level range of
the oil gauge in the stable condition with the Rotary Table stopped, supply
lubricant.
 When the Rotary Table is in operation, the level of lubricant may be lower than the
specified level range of the oil gauge due to the circulation or agitation of lubricant.
 Be sure to check the level of lubricant when the Rotary Table is stopped and is in the
stable condition. Depending on the viscosity or agitation of lubricant under the working
conditions, it takes some time before the lubricant gathers in the low-lying section
inside the Rotary Table and becomes stabilized. It is recommended to stop the Rotary
Table and wait for one to three hours (depends on the installation or working
conditions of the Rotary Table) before checking the level of lubricant.
 When supplying lubricant, check the condition of sealed lubricant and leakage. If the
lubricant is excessively contaminated, replace it entirely. Determine whether or not to
use the Rotary Table continuously depending on the leaking section.
2) Clean around the lubricant feed port. Chips or dust in the Rotary Table may
cause interference with gears, seizure, etc.
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Mounting and Dismounting the Motor Cover Section for the
Rotating Axis
Support tail
Motor cover base
O-ring (Gs160)
Motor cover
Motor cover fixing bolt
Packing
Protective cover
Cable connector box
Cable connector box fixing bolt and seal washer
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Refer to "Mounting and Dismounting the Cable Connector Section" (P-16), and
remove the cable connector box from the motor cover.
 In "Mounting and Dismounting the Cable Connector Section", the procedure for
disconnecting the piping and the electric cables for the units is explained.
3) Loosen the motor cover fixing bolts (4-M5), and remove the motor cover and the protective
cover from the motor cover base.
 A protective cover is attached to the flange section of the motor cover. The motor cover
and the protective cover are secured to the motor cover base (support tail) with the motor
cover fixing bolts.
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4) Conduct the desired maintenance work.
5) Clean inside the motor cover and the motor cover mounting section.
6) Attach the O-rings (Gs160) to the O-ring grooves on the motor cover base.
7) Attach the motor cover and the protective cover to the motor cover base.
 When attaching, check the inside of the motor cover through the opening where the cable
connector box is removed to prevent distortion or bending of electric cables and piping as
well as damage to the units.
 The motor cover and the protective cover are secured together with the motor cover fixing
bolts.
8) Refer to "Mounting and Dismounting the Cable Connector Section" (P-16), and
attach the cable connector box to the motor cover.
 In "Mounting and Dismounting the Cable Connector Section", the procedure for
re-connecting the piping and the electric cables for the units is explained.
1) Refer to the electric connection diagram when disconnecting or connecting
electric cables.
1) When the motor cover is removed, clean the inside of the motor cover.
 Coolant may gather inside the motor cover and may cause corrosion of the motor
cover or main body frame, or a malfunction of the motor. When any cover is removed,
be sure to clean the inside. If corrosion occurs, remove corrosion and apply
rust-preventive oil to the section.
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Mounting and Dismounting the Motor Cover Section for the Tilting
Axis
O-ring (P26)
LS case
Duct
O-ring (S240)
Maintenance cover fixing
bolt and seal washer
Maintenance cover
Packing
Main body frame
Motor
(For the tilting axis)
Cable connector cover
Motor cover
Motor cover fixing bolt
Packing
Cable connector cover fixing
bolt and seal washer
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Loosen the maintenance cover fixing bolts (8-M4), and remove the maintenance cover
from the motor cover.
 This opening can be used to check the inside the motor cover.
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3) Refer to "Mounting and Dismounting the Cable Connector Section" (P-16), and
remove the cable connector cover from the motor cover.
 In "Mounting and Dismounting the Cable Connector Section", the procedure for
disconnecting the piping and the electric cables for the units is explained.
4) Disconnect electric cables (for power and detector) from the motor.
5) Loosen the motor cover fixing bolts (4-M6), and remove the motor cover from the main
body frame.
 The electric cable of the overtravel prevention unit is placed in the duct. Be careful not to
strain the electric cable while pulling the duct out from the LS case.
6) Conduct the desired maintenance work.
7) Clean the cover mounting sections and the inside of the motor cover.
8) Attach the O-rings (S240) to the respective O-ring grooves on the main body frame.
9) Attach the O-ring (P26) to the O-ring groove on the duct, and attach the motor cover to the
main body frame.
 Pass the electric cable of the overtravel prevention unit in the duct, lightly insert the duct
into the LS case, and then attach the motor cover to the main body frame.
10) Connect the electric cables (for power and detector) to the motor.
11) Refer to "Mounting and Dismounting the Cable Connector Section" (P-16), and
attach the cable connector cover to the motor cover.
 In "Mounting and Dismounting the Cable Connector Section", the procedure for
re-connecting the piping and the electric cables for the units is explained.
12) Attach the packing and the maintenance cover to the motor cover.
Be sure to set the seal washers to the maintenance cover fixing bolts (8-M4).
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1) Refer to the electric connection diagram when disconnecting or connecting
electric cables.
1) When the motor cover is removed, clean the motor cover and the main body
frame.
 Coolant may gather inside the motor cover and may cause corrosion of the motor
cover or main body frame, or a malfunction of the motor. When any cover is removed,
be sure to clean the inside. If corrosion occurs, remove corrosion and apply
rust-preventive oil to the section.
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Mounting and Dismounting the Cable Connector Section
For the rotating axis
Cable connector box
Connector
For the tilting axis
Cable connector box fixing
bolt and seal washer
Cable connector cover
fixing bolt and seal washer
Cable connector cover
Connector
Packing
Electric
cables for
motors
Connecting pipe
Electric cables
for motors
Packing
Piping joint
Connecting pipe
Motor cover
Interface cable
Cable connector box or cable connector cover
Pneumatic feed port
The reference figure shows an example system, and the shape and the mounting position of
the cable connector section may not be the same as those on the Rotary Table delivered to
your shop. For details, check the cable connector section and the electric connection diagram
of your machine.
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Remove the cable connector section from the motor cover.
 For the rotating axis, loosen the cable connector box fixing bolts (8-M4), and remove the
cable connector box from the motor cover.
 For the tilting axis, loosen the cable connector cover fixing bolts (8-M4), and remove the
cable connector cover from the motor cover.
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3) Refer to "Connecting and Disconnecting the Piping" (P-18), and remove the pipe
from the piping joint at the backside of the pneumatic feed port.
4) Disconnect electric cables (for power and detector) from the motor.
5) Disconnect the electric cables for the units.
 For the rotating axis, the electric cables of the clamp confirmation unit, ZRN deceleration
signal unit, and solenoid valve are connected via connectors.
 For the tilting axis, the electric cables of the clamp confirmation unit, ZRN deceleration
signal unit, solenoid valve, and overtravel prevention unit are connected via connectors.
6) Conduct the desired maintenance work.
7) Re-connect the electric cables for the units.
8) Connect the electric cables (for power and detector) to the motor.
9) Refer to "Connecting and Disconnecting the Piping" (P-18), and connect the
connecting pipe to the piping joint at the backside of the pneumatic feed port.
10) Attach the packing and the cable connector section to the relevant motor cover.
 For the rotating axis, be sure to set seal washers to the cable connector box fixing bolts
(8-M4).
 For the tilting axis, be sure to set seal washers to the cable connector cover fixing bolts
(8-M4).
1) When disconnecting and connecting an electric cable, refer to the electric
connection diagram and check the connection number.
2) Attach the relevant motor cover to the cable connector section being careful not
to entangle or distort any electric cables and the piping.
 Entanglement or distortion of an electric cable could cause a problem in connection to
the units, resulting in malfunction or damage to the Rotary Table.
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Connecting and Disconnecting the Piping
Flexible Hose Piping
How to disconnect
Piping joint body
Push ring
How to connect
Tube end
Push ring
[Instructions]
1) To remove the connecting pipe, push the push ring in the axial direction with your finger
while pulling the pipe.
2) To attach the connecting pipe, insert the pipe into the mounting hole on the piping joint until
it reaches the tube end.
3) Pull the pipe lightly and check that it does not come off.
1) Do not remove the connecting pipe with pneumatic pressure being supplied.
2) Do not pull the connecting pipe without pushing the push ring at the piping joint.
1) If you continue other maintenance work with the connecting pipe removed,
cover the pipe end portion with tape or cloth to prevent the entry of dust and dirt
and damage.
 If anything enters in the connecting pipe, it will be conveyed with working fluid to a unit,
which may defeat correct operation of the unit or may lead to an accident.
1) If the inserting portion of the connecting pipe is damaged, cut the portion at
right angles to the longitudinal direction.
 The connecting pipe has a sufficient length and can be cut if necessary. However, if
the connecting pipe has been cut several times and is not long enough, replace the
pipe with a new one.
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Mounting and Dismounting the LS Case Cover of the Tilting Axis
Drive Section
Main body frame
LS case
(Tilting axis drive section)
Packing
LS case cover
LS case cover fixing bolt and seal washer
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Loosen the LS case cover fixing bolts (8-M4) and remove the LS case cover from the LS
case at the tilting axis drive section.
3) Conduct the desired maintenance work.
4) Clean the LS case cover and the cover mounting section of the LS case.
5) Attach the LS case cover and the packing to the LS case.
1) When the LS case cover is removed, clean the LS case and LS case cover.
 Coolant may gather inside the LS case cover and may cause corrosion of the LS case
cover and the LS case, or a malfunction of the units. When any cover is removed, be
sure to clean the inside. If corrosion occurs, remove corrosion and apply
rust-preventive oil to the section.
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Mounting and Dismounting the Side Cover (A)
Support tail
Rotary Table for
the rotating axis
O-ring (S215)
Side cover (A)
Side cover (A) fixing bolt
Tilting axis drive
section
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Refer to "Supplying and Replacing Lubricant" (P-8), and drain lubricant from the
Rotary Table for the rotating axis.
3) Loosen the side cover (A) fixing bolts (8-M5), and remove the side cover (A) from the main
body frame of the Rotary Table for the rotating axis.
4) Conduct the desired maintenance work.
5) Clean the side cover (A) and the side cover (A) mounting section of the main body frame.
6) Attach the O-ring (S215) and the side cover (A) to the main body frame of the Rotary Table
for the rotating axis.
7) Refer to "Supplying and Replacing Lubricant" (P-8), and supply lubricant to the Rotary
Table for the rotating axis.
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Mounting and Dismounting the Side Cover (B) Section
Tilting axis drive section
Rotary Table for
the rotating axis
Packing
Support tail
Side cover (B)
Side cover (B) fixing bolt
O-ring (G60)
Inner cover
Inner cover fixing bolt
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) When removing the inner cover, refer to "Supplying and Replacing Lubricant" (P-8),
and drain lubricant from the Rotary Table for the rotating axis.
3) Loosen the side cover (B) fixing bolts (10-M5), and remove the side cover (B) from the main
body frame of the Rotary Table for the rotating axis.
4) Loosen the cover fixing bolts (4-M5), and remove the inner cover from the main body frame
of the Rotary Table of the rotating axis.
5) Conduct the desired maintenance work.
6) Clean the covers, the cover mounting section of the main body frame, and the unit housing
section.
 If you removed the inner cover, wipe any lubricant out from the neighboring surfaces.
7) Attach the O-ring (G60) and the inner cover to the main body frame of the Rotary Table for
the rotating axis.
8) Attach the packing and the side cover (B) to the main body frame of the Rotary Table for
the rotating axis.
9) When the inner cover is removed, refer to "Supplying and Replacing Lubricant" (P-8),
and supply lubricant to the Rotary Table for the rotating axis.
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Replacing the Limit Switch for the Clamp Confirmation Unit for the
Rotating Axis
Clamp confirmation unit
Main body frame
(Support tail)
Motor cover base
Limit switch
Motor cover
Tail flange
Stay fixing bolt
Spring
Connecting pipe
Piston
Piping joint
MY packing
Stay
Limit switch
Pressure case
Cover nut
Spring
Piston
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Refer to "Mounting and Dismounting the Motor Cover Section for the Rotating
Axis" (P-10) and remove the motor cover from the motor cover base.
3) Refer to "Connecting and Disconnecting the Piping" (P-18), and disconnect the
piping from the piping joint.
4) Loosen the stay fixing bolts (2-M5), and remove the stay from the tail flange with the clamp
confirmation unit mounted.
5) Disconnect the electric cable from the limit switch.
6) Remove the limit switch and the pressure case from the stay.
7) Loosen the cover nut and disassemble the pressure case.
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8) Clean the cover nut, spring, piston, MY packing and pressure case.
9) Apply grease to the spring, piston and MY packing, assemble them to the pressure case
and secure them with the cover nut.
10) Assemble the pressure case, the stay and a new limit switch.
11) Refer to the electric connection diagram, and connect the electric cable to the limit switch.
12) Attach the stay (clamp confirmation unit) to the tail flange.
13) Refer to "Connecting and Disconnecting the Piping" (P-18), and connect the piping
to the piping joints.
14) Refer to "Mounting and Dismounting the Motor Cover Section for the Rotating
Axis" (P-10) and attach the motor cover to the motor cover base.
1) Refer to the electric connection diagram when disconnecting or connecting
electric cables.
Connecting terminal
Limit switch
Wire marker
Terminal section
Electric cable fixing bolt
Electric cable
 Connect the electric cables according to the indications on the terminal section
(COMMON, NORMALLY OPEN, NORMALLY CLOSED) and the wire markers.
1) Steps 7) to 9) are required for maintenance and adjustment inside the pressure
case. These steps must be followed at the time of limit switch replacement.
 The MY packing attached to the piston may be damaged with years of use. When
replacing the limit switch, overhaul the pressure case and check the parts inside the
pressure case.
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Replacing the Clamp Confirmation Unit for the Tilting Axis
Motor cover
Clamp confirmation unit
Bracket
Bracket fixing bolt
Cylinder
Cylinder fixing bolt
Auto switch
Auto switch
Driver
22.5 mm
(For unclamp confirmation)
Set screw
17.5 mm
Cylinder
Auto switch
(For clamp confirmation)
Piping joint
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Refer to "Mounting and Dismounting the Motor Cover Section for the Tilting Axis"
(P-12), and remove the motor cover from the main body frame.
 In "Mounting and Dismounting the Motor Cover Section for the Tilting Axis", the
procedure for disconnecting the electric cable for the clamp confirmation unit from the
connector is explained.
3) Refer to "Connecting and Disconnecting the Piping" (P-18), and disconnect the
piping from the piping joints.
4) Loosen the cylinder fixing bolts (2-M3), and remove the clamp confirmation unit (cylinder)
from the bracket.
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 If it is not easy to loosen the cylinder fixing bolts with the bracket secured, loosen the
bracket fixing bolts (2-M6) and remove the bracket together with the solenoid valves and
the cylinder.
5) Check the fitting dimension of the auto switch on the cylinder on the new clamp
confirmation unit.
 If the fitting dimension is not consistent with the dimension shown in the reference figure,
adjust it to the specified fitting dimension. The auto switch is secured with the set screw
(M2.5) to the cylinder.
Tighten the set screw (M2.5) with a torque of 0.05 to 0.15 N m after adjustment.

 The electric cables of the auto switches are respectively equipped with a blue connector
for clamp confirmation and a black connector for unclamp confirmation.
 The clamp confirmation unit consists of a cylinder and two auto switches. Be sure to
replace the clamp confirmation unit entirely. Replacement of individual parts is not
possible.
6) Attach a new clamp confirmation unit to the bracket.
 Mount the clamp confirmation unit in the same direction as before removal.
7) Refer to "Connecting and Disconnecting the Piping" (P-18), and connect the piping
to the piping joints.
8) Refer to "Mounting and Dismounting the Motor Cover Section for the Tilting Axis"
(P-12) and attach the motor cover to the main body frame.
 In "Mounting and Dismounting the Motor Cover Section for the Tilting Axis", the
procedure for re-connecting the electric cable for the clamp confirmation unit is explained.
9) Check operations of the clamp confirmation unit.
1) Refer to the electric connection diagram when disconnecting or connecting
electric cables.
2) Adjust the fitting dimension of the auto switch on the cylinder to the specified
fitting dimension.
 If the fitting dimension of the auto switch is different from the specified fitting
dimension, it is not possible to perform clamp confirmation and unclamp confirmation
correctly.
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Replacing the Solenoid Valve for the Rotating Axis
Main body frame
Motor cover base
Solenoid valve
(Support tail)
Solenoid
valve
Motor cover
(For the rotating axis)
Connecting
pipe
Piping joint
Stay
Solenoid valve fixing bolt
Electric cable
Cap
DIN connector fixing bolt
DIN connector
Piping joint
Terminal block
Flat-head
screwdriver
Lead wire fixing screw
(2 positions)
Cap
Lead wire
Solenoid valve body
DIN connector cover
Washer
Seal
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Refer to "Mounting and Dismounting the Motor Cover Section for the Rotating
Axis" (P-10) and remove the motor cover from the motor cover base.
 In "Mounting and Dismounting the Motor Cover Section for the Rotating Axis", the
procedure for disconnecting the electric cable for the solenoid valve from the terminal block
at the cable connector box is explained.
3) Refer to "Connecting and Disconnecting the Piping" (P-18), and disconnect the
piping from the piping joints.
4) Loosen the solenoid valve fixing bolts (2-M2.5), and remove the solenoid valve from the
stay.
5) Loosen the DIN connector fixing bolts, and remove the DIN connector from the solenoid
valve body.
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6) Loosen the DIN connector cap, insert a screwdriver in the section A, and pull the terminal
block out.
7) Loosen the lead wire fixing screws (2 positions) on the side of the terminal block, and
remove the lead wires.
8) Attach a new DIN connector to the electric cable.
 Attach the cap, washer, seal, and the DIN connector cover to the electric cable in this order,
and then connect the lead wires to the terminal block referring to the electric connection
diagram.
9) Mount the terminal block on the DIN connector cover, and secure the electric cable with
the cap.
10) Attach the DIN connector to a new solenoid valve.
Tighten the DIN connector fixing bolt (M3) with a torque of 0.3 to 0.4 N m.

11) Place the new solenoid valve in the same direction as before replacement and secure it on
the stay.
12) Refer to "Connecting and Disconnecting the Piping" (P-18), and connect the piping
to the piping joints.
13) Refer to "Mounting and Dismounting the Motor Cover Section for the Rotating
Axis" (P-10) and attach the motor cover to the motor cover base.
 In "Mounting and Dismounting the Motor Cover Section for the Rotating Axis", the
procedure for connecting the electric cable for the solenoid valve to the terminal block at
the cable connector box is explained.
1) Refer to the electric connection diagram when disconnecting or connecting
electric cables.
1) Before removing the solenoid valve, check and record the positional relation,
such as the mounting direction.
 To keep the new solenoid valve in the same direction as before, record the mounting
direction before removing the old one. Attach the new one while referring to the
record.
 Before removing lead wires, record the connecting position of each lead wire at the
terminal block.
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Replacing the Solenoid Valve for the Tilting Axis
Motor cover
Solenoid valve fixing bolt
Solenoid
valve
Bracket
Bracket fixing bolt
DIN connector fixing bolt
DIN connector
Electric cable
Cap
Solenoid valve
body
Terminal block
Flat-head screwdriver
Lead wire fixing screw
(2 positions)
Electric cable
Piping joint
Solenoid valve
Connecting
pipe
Cap
Washer
Seal
Lead wire
DIN connector cover
Cable connector box or motor cover
Piping joint
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Refer to "Mounting and Dismounting the Motor Cover Section for the Tilting Axis"
(P-12), and remove the motor cover from the main body frame.
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 In "Mounting and Dismounting the Motor Cover Section for the Tilting Axis", the
procedure for disconnecting the electric cable for the solenoid valve from the connector is
explained.
3) Loosen the bracket fixing bolts (2-M6), and remove the bracket with the solenoid valve and
the cylinder mounted.
4) Refer to "Connecting and Disconnecting the Piping" (P-18), and remove the
connecting pipes from the piping joints.
5) Loosen the solenoid valve fixing bolts (2-M2.5), and remove the solenoid valve from the
bracket.
6) Loosen the DIN connector fixing bolts, and remove the DIN connector from the solenoid
valve body.
7) Loosen the DIN connector cap, insert a screwdriver in the section A, and pull the terminal
block out.
8) Loosen the lead wire fixing screws (2 positions) on the side of the terminal block, and
remove the lead wires.
9) Attach a new DIN connector to the electric cable.
 Attach the cap, washer, seal, and the DIN connector cover to the electric cable in this order,
and then connect the lead wires to the terminal block referring to the electric connection
diagram.
Tighten the lead wire fixing screw with a torque of 0.2 to 0.25 N m.

10) Mount the terminal block on the DIN connector cover, and secure the electric cable with
the cap.
Tighten the cap with a torque of 1.65 to 2.5 N m.

11) Attach the DIN connector to a new solenoid valve.
Tighten the DIN connector fixing bolt (M3) with a torque of 0.3 to 0.4 N m.

12) Attach a new solenoid valve to the bracket.
 Mount the solenoid valve in the same direction as before.
13) Refer to the pneumatic circuit diagram and "Connecting and Disconnecting the
Piping" (P-18), and connect the piping to the piping joint.
14) Attach the bracket to the original position.
15) Refer to "Mounting and Dismounting the Motor Cover Section for the Tilting Axis"
(P-12) and attach the motor cover to the main body frame.
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 In "Mounting and Dismounting the Motor Cover Section for the Tilting Axis", the
procedure for re-connecting the electric cable for the solenoid valve is explained.
16) Check operations of the solenoid valve.
1) Refer to the electric connection diagram when disconnecting or connecting
electric cables.
1) Before removing the solenoid valve, DIN connector or terminal block, check and
record the positional relation, such as the mounting direction.
 To keep the new solenoid valve in the same direction as before, record the mounting
direction before removing the old one. Attach the new one while referring to the
record.
 Before removing lead wires, record the connecting position of each lead wire at the
terminal block.
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Replacing the Proximity Switch of the ZRN Deceleration Signal Unit
for the Rotating Axis
First tailstock
Rotary Table for
the rotating axis
Support tail
ZRN deceleration signal unit
Cable
hole
Side cover (B)
ZRN dog
Motor cover
Holder
(For the
rotating axis)
Holder fixing bolt
Electric cable
Proximity switch
Nut
Seal washer
Proximity switch
end face
Holder end face
Connector
Cable connector box
Holder
O-ring (P12)
The ZRN deceleration signal unit for the rotating axis s mounted on the first spindle of the
Rotary Table for the rotating axis.
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Refer to "Supplying and Replacing Lubricant" (P-8), and drain lubricant from the
Rotary Table for the rotating axis.
3) Refer to "Mounting and Dismounting the Motor Cover Section for the Rotating
Axis" (P-10) and remove the motor cover from the motor cover base.
 In "Mounting and Dismounting the Motor Cover Section for the Rotating Axis", the
procedure for disconnecting the electric cable connector for the ZRN deceleration signal
unit is explained.
4) Refer to "Mounting and Dismounting the Side Cover (B) Section" (P-21) and remove
the side cover (B) from the main body frame.
5) Loosen the holder fixing bolt (M5), and remove the holder (ZRN deceleration signal unit) from
the main body frame.
6) Loosen the nut (M8) and remove the proximity switch from the holder.
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7) Align the end face of the new proximity switch with the end face of the holder, and secure
it to the holder.
Attach the seal washer and tighten the nut with a torque of 5 N m.

8) Attach the holder (ZRN deceleration signal unit) to the main body frame.
Tighten the holder fixing bolt (M5) with a torque of 1 to 1.5 N m.

9) Pass the electric cable for the ZRN deceleration signal unit through the cable hole at the
main body frame to the motor cover mounting section.
10) Refer to "Mounting and Dismounting the Side Cover (B) Section" (P-21) and attach
the packing and the side cover (B) to the main body frame.
11) Refer to "Mounting and Dismounting the Motor Cover Section for the Rotating
Axis" (P-10) and attach the motor cover to the motor cover base.
 In "Mounting and Dismounting the Motor Cover Section for the Rotating Axis", the
procedure for connecting the electric cable for the ZRN deceleration signal unit is
explained.
12) Refer to "Supplying and Replacing Lubricant" (P-8), and supply lubricant to the Rotary
Table for the rotating axis.
13) Perform zero return operation and confirm the zero point position.
 For zero return operation or confirmation and adjustment of the grid shift amount, refer to
the operation manual of the control unit and follow the instructions.
1) Refer to the electric connection diagram when disconnecting or connecting
electric cables.
1) Align the end face of the proximity switch with the end face of the holder, and
secure it to the holder.
 If the fitting dimension of the proximity switch is not correct, the switch may collide with
the ZRN dog or may not detect the ZRN dog correctly.
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Adjusting the ZRN Dog Position for the Rotating Axis
Rotary Table for the rotating axis
Inner cover
Opening created by
removing the inner cover
Allen wrench
Packing
Side cover (B)
O-ring (G60)
Inner cover fixing bolt
ZRN dog fixing bolt
Side cover (B) fixing bolt
ZRN dog
Worm wheel
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Refer to "Supplying and Replacing Lubricant" (P-8), and drain lubricant from the
Rotary Table for the rotating axis.
3) Refer to "Mounting and Dismounting the Side Cover (B) Section" (P-21) and remove
the side cover (B) and the inner cover from the main body frame.
4) Perform zero return operation of the rotating axis.
5) Refer to "ZRN Deceleration Signal Unit" in the Setup Manual, and check the positional
relationship between the proximity switch and the ZRN dog of the ZRN deceleration signal
unit.
6) Turn the main spindle with manual control devices until the ZRN dog fixing bolt can be seen
in the approximate center of the opening created by removing the inner cover.
7) Use an Allen wrench and loosen the ZRN dog fixing bolts (M4) by making half a turn.
 When the ZRN dog fixing bolt is loosened, do not remove the Allen wrench from the ZRN
dog fixing bolt. Removing the Allen wrench at this time could cause the ZRN dog to slip,
which may disable further adjustment.
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8) Move the ZRN dog using the Allen wrench as required, and tighten the ZRN dog fixing bolt
(M4) to secure the ZRN dog.
Tighten the ZRN dog fixing bolt (M4) with a torque of 1 to 1.25 N m.

9) Refer to "Mounting and Dismounting the Side Cover (B) Section" (P-21), and attach
the side cover (B) and the inner cover to the main body frame.
10) Refer to "Supplying and Replacing Lubricant" (P-8), and supply lubricant to the Rotary
Table for the rotating axis.
11) Perform zero return operation and confirm the zero point position.
 For zero return operation or confirmation and adjustment of the grid shift amount, refer to
the operation manual of the control unit and follow the instructions.
1) Turn on the power only when operating the Rotary Table, and use manual
control devices for operation. When operation has been completed, turn the
power (primary power) off.
 Connect the interface cable only when it is necessary for the maintenance work and
disconnect it if not necessary.
1) When loosening the ZRN dog fixing bolt, do not loosen it by more than one
revolution.
 If you loosen it by more than one revolution, the ZRN dog may come off from the main
spindle.
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Replacing the Proximity Switch of the ZRN Deceleration Signal Unit
for the Tilting Axis
ZRN deceleration signal unit
Holder fixing bolt and washer
Clamp unit and solenoid valve
Motor cover
Main body frame
Bracket
Bracket fixing bolt
Proximity switch
Electric cable
Nut
Cable connector cover
210.2 mm
Connector
Fitting dimension
Push ring
O-ring (AS568-205A)
Holder
O-ring (P16)
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Refer to "Mounting and Dismounting the Motor Cover Section for the Tilting Axis"
(P-12) and remove the motor cover.
 In "Mounting and Dismounting the Motor Cover Section for the Tilting Axis", the
procedure for disconnecting the electric cable connector for the ZRN deceleration signal
unit is explained.
3) Loosen the bracket fixing bolts (2-M6), and remove the bracket with the solenoid valve and
the clamp confirmation unit mounted.
4) Loosen the holder fixing bolt (M6), and remove the ZRN deceleration signal unit from the
main body frame.
5) Loosen the nut (M12) and remove the proximity switch from the holder.
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6) Adjust the new proximity switch to the fitting dimension of 21 mm  0.2 mm and secure it
to the holder.
Tighten the nut with a torque of 10 N m.

7) Set the O-ring (P16) to the holder, and attach the holder (ZRN deceleration signal unit) to
the main body frame.
Set the washer to the holder fixing bolt (M6) and tighten it with a torque of 13.2 to 15.7 N m.

8) Attach the bracket to the main body frame with the solenoid valve and the clamp
confirmation unit mounted.
9) Refer to "Mounting and Dismounting the Motor Cover Section for the Tilting Axis"
(P-12) and attach the motor cover to the original position.
 In "Mounting and Dismounting the Motor Cover Section for the Tilting Axis", the
procedure for connecting the electric cable for the ZRN deceleration signal unit is
explained.
1) Refer to the electric connection diagram when disconnecting or connecting
electric cables.
1) Secure the proximity switch to the holder with the specified fitting dimension.
 If the fitting dimension of the proximity switch is not correct, the switch may collide with
the ZRN dog or may not detect the ZRN dog correctly.
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Adjusting the ZRN Dog Position for the Tilting Axis
Main body frame
Plug
ZRN dog
(Tilting axis drive section)
ZRN dog fixing bolt
Worm wheel
Hole for adjusting
the dog position

Allen wrench
Plug
ZRN dog
ZRN dog
fixing bolt
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Remove the plug (R1/4) from the main body frame.
3) Perform zero return operation of the main spindle.
4) Refer to "ZRN Deceleration Signal Unit" in the Setup Manual, and check the positional
relationship between the proximity switch and the ZRN dog of the ZRN deceleration signal
unit.
5) Turn the main spindle with manual control devices until the ZRN dog fixing bolt can be seen
in the approximate center of the lubricant feed port.
6) Use an Allen wrench and loosen the ZRN dog fixing bolts (M5) by making half a turn.
 When the ZRN dog fixing bolt is loosened, do not remove the Allen wrench from the ZRN
dog fixing bolt. Removing the Allen wrench at this time could cause the ZRN dog to slip,
which may disable further adjustment.
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7) Move the ZRN dog using the Allen wrench as required, and tighten the ZRN dog fixing bolt
(M5) to secure the ZRN dog.
Tighten the ZRN dog fixing bolt (M5) with a torque of 1 to 1.5 N m.

8) Attach the plug (R1/4) to the main body frame.
Apply sealant to the plug (R1/4) before tightening the cap.
9) Perform zero return operation and confirm the zero point position.
 For zero return operation or confirmation and adjustment of the grid shift amount, refer to
the operation manual of the control unit and follow the instructions.
1) Turn on the power only when operating the Rotary Table, and use manual
control devices for operation. When operation has been completed, turn the
power (primary power) off.
 Connect the interface cable only when it is necessary for the maintenance work and
disconnect it if not necessary.
1) When loosening the ZRN dog fixing bolt, do not loosen it by more than one
revolution.
 If you loosen it by more than one revolution, the ZRN dog may come off from the main
spindle.
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Replacing the Limit Switch for the Overtravel Prevention Unit for
the Tilting Axis
Main body frame
LS case
(Tilting axis drive section)
Packing
Motor cover
LS case cover
Switch base
Limit switch
Switch base fixing bolt
3.2 - 4 mm
Dog allowance
LS case cover fixing bolt
and seal washer
Deceleration dog
Limit switch
fixing bolt
Limit switch
Connector
Washer
Limit switch
Switch base
Electric cable
Cable connector cover
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Refer to "Mounting and Dismounting the LS Case Cover of the Tilting Axis Drive
Section" (P-19) and remove the LS case cover from the LS case.
3) Refer to "Mounting and Dismounting the Motor Cover Section for the Tilting Axis"
(P-12), and remove the motor cover from the main body frame.
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 In "Mounting and Dismounting the Motor Cover Section for the Tilting Axis" (P-12),
the procedure for disconnecting the electric cable connector for the overtravel prevention
unit is explained.
4) Loosen the limit switch fixing bolts (2-M4), and remove the limit switch from the switch
base.
5) Attach a new limit switch to the switch base.
Set the washers to the limit switch fixing bolts (2-M4) and tighten the bolts with a torque of
1.2 to 1.5 N m.

 Check that there is an allowance of 3.2 mm to 4.0 mm when the limit switch is activated at
the deceleration stop dog.
6) Pass the electric cable of the overtravel prevention unit through the cable hole on the LS
case to the motor cover mounting section.
 Bundle the electric cables neatly so that they will not interfere with the motion of the
overtravel prevention unit.
7) Refer to "Mounting and Dismounting the Motor Cover Section for the Tilting Axis"
(P-12) and attach the motor cover to the main body frame.
 In "Mounting and Dismounting the Motor Cover Section for the Tilting Axis", the
procedure for re-connecting the electric cable for the overtravel prevention unit is
explained.
8) Check the actuation angle of the overtravel prevention unit.
9) Refer to "Mounting and Dismounting the LS Case Cover of the Tilting Axis Drive
Section" (P-19) and attach the LS case cover to the LS case.
1) Refer to the electric connection diagram when disconnecting or connecting
electric cables.
2) Mount the limit switch in the correct direction.
 Mounting in the wrong direction would change the position where the overtravel
prevention unit produces the signal. If a situation that requires an emergency stop
arises, an appropriate motion may not be triggered and the workpiece may collide with
the machine tool table, resulting in damage to the machine tool or Rotary Table or
flying the workpiece off.
3) Check the actuation angle of the overtravel prevention unit.
 If the actuation angle is not consistent with the specification value, an accident may be
caused during operation of the Rotary Table.
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Adjusting the Deceleration Dog Position for the Tilting Axis
Main body frame
(Tilting axis drive section)
Packing
LS case cover
LS case cover fixing bolt
and seal washer
LS case
Overtravel prevention unit
(Limit switch)
Main spindle
Marking
Deceleration
dog fixing bolt
Deceleration dog in the negative () direction
Deceleration dog in the positive (+) direction
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Refer to "Mounting and Dismounting the LS Case Cover of the Tilting Axis Drive
Section" (P-19) and remove the LS case cover from the LS case.
3) Put a match mark to show the positional relation between the main spindle and the
deceleration dog with a felt pen.
 A deceleration dog consists of two pieces: a piece on the positive (+) side and the other
piece on the negative () side.
4) Loosen the deceleration dog fixing bolts (2-M4) on the required side by making a half or
one turn.
5) Refer to the match mark and move the deceleration dog to the appropriate position.
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 Refer to the match mark, and check the direction and distance the dog should be moved.
If you have moved the deceleration dog a big distance by mistake, align the deceleration
dog to the match mark to move it close to the position before adjustment.
 The mounting hole of the deceleration dog fixing bolt is oblong-shaped.
6) Secure the deceleration dog to the main spindle.
Tighten the deceleration dog fixing bolts (2-M4) with a torque of 3.9 to 4.7 N m.

7) Refer to "Mounting and Dismounting the LS Case Cover of the Tilting Axis Drive
Section" (P-19) and attach the LS case cover to the LS case.
8) Check the actuation angle of the deceleration unit.
1) Check the actuation angle of the deceleration unit.
 If the actuation angle is not consistent with the specification value, an accident may be
caused during operation of the Rotary Table.
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Mounting and Dismounting the Motor for the Rotating Axis
Main body frame
Tail flange
(Support tail)
Motor cover base
Motor cover
Tail flange
Pinion gear
Spur gear
O-ring (S80)
Nut
Motor
Washer
Motor fixing bolt and
spring washer
Woodruff key
When loosening
When tightening
Pinion gear
Working torque
direction
Nut
Wrench
Lock metal
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Refer to "Supplying and Replacing Lubricant" (P-8), and drain lubricant from the
Rotary Table for the rotating axis.
3) Refer to "Mounting and Dismounting the Motor Cover Section for the Rotating
Axis" (P-10) and remove the motor cover from the motor cover base.
 In "Mounting and Dismounting the Motor Cover Section for the Rotating Axis"
(P-10), the procedure for disconnecting the electric cable of the motor is explained.
M-307-M-A
44
4) Arrange a temporary support with lifting tools so that the motor can be hoisted at any time.
5) Loosen the motor fixing bolts (4-M6), remove the motor from the tail shaft, and place it on
an appropriate work bench.
 Pull the motor horizontally being careful not to damage the gear.
6) Loosen the nut (M6) and remove the pinion gear and the woodruff key from the motor shaft.
 When you loosen the nut, the pinion gear (motor shaft) may rotate in the working torque
direction.Take appropriate measures to prevent it from rotating.
Under "When loosening" in the reference figure, a lock metal is illustrated as directly
being applied to the gear teeth. When such a lock metal is used, make it of brass or
aluminum so that it will not damage the gear teeth.
 If the pinion gear and the motor shaft cannot be disengaged by loosening the nut, dismount
the pinion gear with the pinion gear pulling jig (pulley puller, etc.).
7) Clean the removed parts and O-rings, and if any part is damaged, replace it with a new one.
8) Set the woodruff key to the motor shaft, and secure the pinion gear to the motor shaft.
Tighten the nut (M6) with a torque of 7.8 N m.

 Be sure to use the nut and washer attached to the motor.
 Take appropriate measures to prevent the pinion gear from rotating as shown for "When
tightening".
 When a new woodruff key that is attached to the motor is used, it may interfere with the
bottom face of the keyway on the pinion gear. If the woodruff key interferes with the bottom
face of the keyway, cut away the interfering area of the woodruff key so that the pinion gear
will be in absolute contact with the tapered section of the motor shaft. Cut the woodruff key
so that a slight clearance will be created between the woodruff key and the bottom face of
the keyway. If the woodruff key is cut too much and has a great clearance, it will not work
as a woodruff key.
9) Set the O-ring (S80) to the relevant position at the motor and attach the motor to the tail
flange.
Tighten the motor fixing bolts (4-M6) with a torque of 9 to 13.2 N m.

 Insert the motor horizontally being careful not to damage the gear.
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10) Clean the spilled lubricant from the surroundings.
11) Turn the motor at a low speed in the normal and reverse directions using manual control
devices, and check the noise level generated from the gear engagement section.
 If noise from the gear engagement section is abnormally loud or the noise level largely
changes depending on the rotation direction, re-adjust the clearance between the pinion
gear and the spur gear.
When adjusting, loosen the motor fixing bolts slightly, apply a wooden or brass bar to the
flange section of the motor, and lightly hit it with a shockless hammer to move the motor
position until a clearance between the pinion gear and the spur gear is adjusted to about
0.02 to 0.03 mm.
12) Refer to "Mounting and Dismounting the Motor Cover Section for the Rotating
Axis" (P-10) and attach the motor cover to the motor cover base.
 In "Mounting and Dismounting the Motor Cover Section for the Rotating Axis"
(P-10), the procedure for re-connecting the electric cable for the motor is explained.
13) Refer to "Supplying and Replacing Lubricant" (P-8), and supply lubricant to the Rotary
Table for the rotating axis.
14) Set the zero point position again.
 The relative position of the motor may be displaced after re-assembly. Check and set the
zero point position again.
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1) Turn on the power only when operating the Rotary Table, and use manual
control devices for operation. When operation has been completed, turn the
power (primary power) off.
 Connect the interface cable only when it is necessary for the maintenance work and
disconnect it if not necessary.
1) When mounting or removing the pinion gear on or from the motor shaft, take an
appropriate measure to prevent the pinion gear from rotating before loosening
or tightening the nuts.
 Without appropriate measure to prevent the pinion gear from rotating, the gear would
idle, resulting in lacerations on your hand or finger.
1) When removing the motor from the tail flange, move the motor horizontally
being careful not to damage the gear.
 Damage to the gear could lower indexing accuracy of the Rotary Table and produce
noises.
2) If a loud noise is heard from the gear engagement section or the noise level
largely changes depending on the rotation direction, re-adjust the clearance
between the pinion gear and the spur gear.
 If a loud noise is heard during motor rotation or if the noise level largely changes
depending on the rotation direction, the clearance between the gears may not be
appropriate. Make the adjustment again.
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Mounting and Dismounting the Motor for the Tilting Axis
Main body frame
(Tilting axis drive section)
Motor
Motor bracket
Pinion gear
O-ring (S80)
Nut
Washer
Motor
Woodruff key
Spur gear
Pinion gear
Motor
When loosening
Motor fixing bolt and spring washer
When tightening
Pinion gear
Working torque
direction
Nut
Wrench
Lock metal
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Refer to "Supplying and Replacing Lubricant" (P-8), and drain lubricant from the tilting
axis drive section.
3) Refer to "Mounting and Dismounting the Motor Cover Section for the Tilting Axis"
(P-12), and remove the motor cover from the main body frame.
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 In "Mounting and Dismounting the Motor Cover Section for the Tilting Axis", the
procedure for disconnecting the electric cable of the motor is explained.
4) Arrange a temporary support with lifting tools so that the motor can be hoisted at any time.
 In order to prevent the motor from dropping when the motor fixing bolts are loosened, be
sure to support the motor with lifting tools.
5) Loosen the motor fixing bolts (4-M6), remove the motor from the motor bracket, and place
it on an appropriate work bench.
 Pull the motor horizontally being careful not to damage the gear.
6) Loosen the nut (M10) and remove the pinion gear and the woodruff key from the motor
shaft.
 When you loosen the nut, the pinion gear (motor shaft) may rotate in the working torque
direction. Take appropriate measures to prevent it from rotating.
Under "When loosening" in the reference figure, a lock metal is illustrated as directly
being applied to the gear teeth. When such a lock metal is used, make it of brass or
aluminum so that it will not damage the gear teeth.
 If the pinion gear and the motor shaft cannot be disengaged by loosening the nut, dismount
the pinion gear with the pinion gear pulling jig (pulley puller, etc.).
7) Clean the removed parts (nut, washer, pinion gear, woodruff key) and O-rings, and if any
part is damaged, replace it with a new one.
8) Set the woodruff key to the motor shaft, and secure the pinion gear to the motor shaft.
Tighten the nut (M10) with a torque of 19.6 N m.

 Be sure to use the nut and washer attached to the motor.
 Take appropriate measures to prevent the pinion gear from rotating as shown for "When
tightening".
 When a new woodruff key that is attached to the motor is used, it may interfere with the
bottom face of the keyway on the pinion gear. If the woodruff key interferes with the bottom
face of the keyway, cut away the interfering area of the woodruff key so that the pinion gear
will be in absolute contact with the tapered section of the motor shaft. Cut the woodruff key
so that a slight clearance will be created between the woodruff key and the bottom face of
the keyway. If the woodruff key is cut too much and has a great clearance, it will not work
as a woodruff key.
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9) Set the O-ring (S80) to the relevant position at the motor and attach the motor to the motor
bracket.
Tighten the motor fixing bolts (4-M6) with a torque of 9 to 13.2 N m.

 Insert the motor horizontally being careful not to damage the gear.
10) Clean the spilled lubricant from the surroundings.
11) Turn the motor at a low speed in the normal and reverse directions using manual control
devices within the possible tilting angle range, and check the noise level generated from
the gear engagement section.
 If noise from the gear engagement section is abnormally loud or the noise level largely
changes depending on the rotation direction, re-adjust the clearance between the pinion
gear and the spur gear.
When adjusting, loosen the motor fixing bolts slightly, apply a wooden or brass bar to the
flange section of the motor, and lightly hit it with a shockless hammer to move the motor
position until a clearance between the pinion gear and the spur gear is adjusted to about
0.02 to 0.03 mm.
12) Refer to "Mounting and Dismounting the Motor Cover Section for the Tilting Axis"
(P-12) and attach the motor cover to the main body frame.
 In "Mounting and Dismounting the Motor Cover Section for the Tilting Axis", the
procedure for re-connecting the electric cable for the motor is explained.
13) Refer to "Supplying and Replacing Lubricant" (P-8), and supply lubricant to the tilting
axis drive section.
14) Set the zero point position again.
 The relative mounting position of the motor may be displaced after re-assembly. Set the
zero point position again.
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1) Turn on the power only when operating the Rotary Table, and use manual
control devices for operation. When operation has been completed, turn the
power (primary power) off.
 Connect the interface cable only when it is necessary for the maintenance work and
disconnect it if not necessary.
1) When mounting or removing the pinion gear on or from the motor shaft, take an
appropriate measure to prevent the pinion gear from rotating before loosening
or tightening the nuts.
 Without appropriate measure to prevent the pinion gear from rotating, the gear would
idle, resulting in lacerations on your hand or finger.
1) When dismounting or mounting the motor at the motor bracket, move the motor
horizontally being careful not to damage the gear.
 Damage to the gear could lower indexing accuracy of the Rotary Table and produce
noises.
2) If a loud noise is heard from the gear engagement section or the noise level
largely changes depending on the rotation direction, re-adjust the clearance
between the pinion gear and the spur gear.
 If a loud noise is heard during motor rotation or if the noise level largely changes
depending on the rotation direction, the clearance between the gears may not be
appropriate. Make the adjustment again.
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Measuring Worm Gear Backlash
Rotating axis
Measuring
radius position
Main spindle
Rotating axis
center
Working direction
Dial gauge
Tilting axis
Dial gauge
Main spindle
Working direction
Block gauge
Measuring
radius position
Rotating axis
center
Dial gauge
Tilting axis center
Dial gauge
Eccentric moment by the
Rotary Table section for the
rotating axis
Rotary Table for the rotating axis
Tilting axis center
Eccentric load of the Rotary Table
section for the rotating axis
The Rotary Table for the rotating axis consists of two main spindles; make backlash
measurement at each main spindle, first and second, separately.
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
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2) Place the Rotary Table on an appropriate work bench for measurement. Wait until the
temperature of the Rotary Table reaches 20C by setting the measuring room air
conditioner to 20C.
3) Prepare a block gauge and a dial gauge with minimum scales of 0.002 mm.
4) The dial gauge should be set in such a position on the rotating axis or the tilting axis where
the displacement in the working direction shown in the reference figure can be measured.
 Measurement on the rotating axis
Attach a block gauge using the tapped holes (4-M8) on the end face of the main spindle,
and set a dial gauge to the side of the block gauge.
 Measurement on the tilting axis
Set a dial gauge on the end face near the outer position of the main spindle for the rotating
axis.
5) Measure the backlash on the rotating axis and the tilting axis as described below.
 Measurement on the rotating axis
Apply a working torque in one direction shown by the arrows. Then, release the working
torque, and read the indication on the dial gauge. Apply a working torque in the other
direction. Release the working torque, and read the indication on the dial gauge.
The standard torque to apply is approximately 2.9 to 4.4 N m; however, be sure to apply

enough torque to make the worm and the worm wheel teeth in contact precisely.
 Measurement on the tilting axis
Measure the backlash in the direction as the eccentric moment produced by the Rotary
Table section for the rotating axis without applying a working torque.
When measuring the backlash in the direction opposite to the eccentric moment produced
by the Rotary Table section for the rotating axis, apply working torque to bring the worm
and the worm wheel teeth in the tilting axis drive section into good contact.
 In the reference figure, a slab is attached to the main spindle end face of the rotating axis,
and the working torque is manually applied using the slab.
6) Record the difference between two dial gauge readings that are measured by moving the
axis in both directions.
This difference in dial gauge reading should be taken as backlash.
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7) Remove the dial gauge and the slab.
8) Rotate the rotating axis or the tilting axis, on which you are making measurement, using
manual control devices to change the worm gear engaging position.
 Measure the backlash at eight positions (every 45 degrees) for the rotating axis.
 For the tilting axis, measure backlash at 5 to 9 positions at every 15 to 30 degrees in the
range of 17 degrees to +107 degrees.
9) Repeat steps 4) through 8) to measure the backlash, and record the measuring position
and the backlash.
10) From the recorded backlash, judge whether the backlash adjustment is necessary or not.
 If the measured backlash amount exceeds the limit of the compensable range by the
control unit, backlash adjustment is required.
Relation between the measured value and the converted backlash amount
Rotating axis,
tilting axis
Converted value of minimum backlash
amount at the measuring radius position
Measuring
radius position
Approx. 4 m (1 sec.  0.218 m)
45 mm
(90-mm)
Note: The converted value refers to the measurement at the measuring radius position
when the minimum backlash amount is 20 sec.
 When adjusting the backlash, adjust the engaging position of the worm gear so that the
backlash will be minimal.
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1) Turn on the power only when operating the Rotary Table, and use manual
control devices for operation. When operation has been completed, turn the
power (primary power) off.
 Connect the interface cable only when it is necessary for the maintenance work and
disconnect it if not necessary.
 Remove the dial gauge and the slab before operating the Rotary Table.
1) The temperature may affect backlash measurement. Do not conduct
measurement before the temperature of the Rotary Table reaches around 20C.
2) Make backlash measurement when the tooth flanks of the worm teeth and the
worm wheel teeth are in good contact.
 The following figure illustrates the clearance at tooth flanks (backlash amount) at the
engaging area between the worm teeth and worm wheel teeth.
Worm wheel
Clearance
(Backlash)
Status (A)
Status (B)
Worm spindle
(fixed)
Since the movement distance (clearance) is measured when the worm wheel is
moved from the status (A) to the status (B) as the backlash amount, the tooth flanks
of the worm teeth and the worm wheel teeth must be in good contact. Apply a working
torque until the worm teeth and the worm wheel teeth come into contact.
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Adjusting Worm Gear Backlash of the Rotary Table for the Rotating
Axis
Main body frame
Coupling
(Rotary Table for the rotating axis)
Worm spindle holder
for the first spindle
Joint shaft
Side cover (A)
Fitting dimension
0 - 1 mm
Coupling end face
Joint shaft end face
Worm spindle
(First spindle)
Worm spindle holder
(First spindle)
Backlash adjusting hole
(3.5 hole)
Lock screw
Coupling (A)
(first spindle)
Joint shaft
Coupling (B)
Worm spindle
(Second spindle)
Worm spindle holder
(Second spindle)
Backlash adjusting hole
(3.5 hole)
Lock screw
Side cover (A)
(second spindle)
Phase adjusting hole
(3.5 hole)
Worm spindle
Coupling
(First spindle)
Lock bolt
Direction L
Joint shaft
Round bar
Direction R
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Backlash adjustment for both worm gears for the first and second spindles can be performed
in the same procedure. It is necessary to disengage the worm spindles between the first
spindle and the second spindle before adjusting each worm gear. In the instructions, the
explanation is given without distinction between the first and second spindles. Consequently,
steps 8) to 12) should be performed for both worm gears at the first and second spindles.
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Reset the tilting angle of the tilting axis to 0 degrees.
3) Refer to "Supplying and Replacing Lubricant" (P-8), and drain lubricant from the
Rotary Table for the rotating axis.
4) Perform zero return operation of the rotating axis.
Reference pin
Main spindle
(Second spindle)
Dimension between
reference pins "L"
Reference pin
Main spindle
(First spindle)
5) Refer to "Aligning Phase between the First Spindle and the Second Spindle of the
Rotary Table for the Rotating Axis" (P-62), attach the reference pins to the main spindle,
measure the dimension "L" between the reference pins, and record the dimension.
6) Refer to "Mounting and Dismounting the Side Cover (A)" (P-20) and remove the side
cover (A) from the main body frame.
7) Loosen the lock bolts (5-M5) of the coupling (A) by 2 or 3 turns to disengage the worm
spindles between the first spindle and the second spindle.
 The phase adjusting hole (3.5 mm) is provided on the worm spindle for the second
spindle. When a round bar is inserted into this phase adjusting hole, it can be used for
turning the worm spindle or preventing unnecessary rotation that may occur when
loosening the lock bolt.
8) Loosen the lock screws (M5) at the first and second spindles to release a lock of the worm
spindle holders at the first and second spindles.
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9) Adjust the worm spindle holder evenly by the number of turns calculated from the required
amount of adjustment using the following formula.
N = (C  B) / A............... Required amount of adjustment
When N > 0:
Turn the work spindle holder in the direction R. (Decrease the backlash.)
When N < 0:
Turn the work spindle holder in the direction L. (Increase the backlash.)
A: Converted amount of adjustment per rotation of the worm spindle holder at
the measuring position (m)
B: Converted amount at the measuring position for the setting backlash amount
(m)
C: Minimum backlash obtained by backlash measurement (m)
Converted amount of adjustment per rotation
of the worm spindle holder
Converted amount of
adjustment in seconds
A
Approx. 146 sec.
Approx. 32 m
Measuring
radius position
45 mm
(90-mm)
Converted amount for the setting backlash amount: B
25 sec.
30 sec.
35 sec.
40 sec.
5 m
7 m
8 m
9 m
Measuring
radius position
45 mm
(90-mm)
 The worm spindle holder has eight 3.5-mm holes for backlash adjustment. Insert a round
bar into this hole and turn the worm spindle holder.
10) Tighten the lock screws slightly, measure the fixed position of the worm spindle holder, and
check that it is below the limit.
 Measure the distance from the worm spindle fixed position shown in the reference figure
and compare it with the limit of adjustment amount given in the table below.
 If the fixed position of the worm spindle holder for either (or both) the first or second spindle
reaches the limit, the life of the worm gear on the Rotary Table should be considered as
expired when no adjustment is possible. In this case, stop conducting the backlash
adjustment as well as stop using the Rotary Table.
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<Limit position of worm spindle>
First tailstock
Second spindle
12 mm
12 mm
Second spindle
First tailstock
Worm spindle
of the first spindle
Worm spindle
of the second spindle
Fixed position
measurement
Main body
frame
Fixed position
measurement
Worm spindle holder
Lock screw
11) Tighten the lock screw (M5) with a torque of 0.5 to 1 N m and fix the worm spindle holder.

 The worm spindle holder and the main body frame are connected by means of internal and
external threads. The male threaded portion of the worm spindle holder exerts a force to
the padded lock screw and prevents rotation. Do not apply a torque greater than the
specified torque.
12) Record the amount of movement or rotation of the worm spindle holder as well as the date
and time of adjustment.
13) Refer to "Aligning Phase between the First Spindle and the Second Spindle of the
Rotary Table for the Rotating Axis" (P-62), and align phase of the worm spindles for the
first spindle and the second spindle.
14) Adjust the dimension between the coupling (A) end face and the end face of the joint shaft
to the fitting dimension of 0 to 1 mm, and connect the worm spindles for the first spindle
and the second spindle.
Tighten the lock bolts (5-M5) with a torque of 10 N m.

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 When connecting, be careful not to cause the worm spindles at the first and second
spindles to go out of phase alignment.
15) Refer to "Mounting and Dismounting the Side Cover (A)" (P-20), and attach the side
cover (A) to the main body frame.
16) Remove the reference pins from the main spindle.
17) Refer to "Supplying and Replacing Lubricant" (P-8), and supply lubricant to the Rotary
Table for the rotating axis.
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1) Tighten the lock screw with the specified tightening torque.
1) NEVER remove any lock screws. Loosen them only to unfasten the worm
spindle holder.
2) When adjusting the backlash, adjust the engaging position of the worm gear so
that the backlash will be minimal.
3) Stop conducting backlash adjustment as well as using the Rotary Table when
the worm spindle holder fixed position reaches the limit.
 If the worm spindle holder fixed position reaches the limit due to backlash adjustment,
the life of the worm gear on the Rotary Table should be considered as expired.
 Before adjusting the backlash, be sure to measure and record the worm spindle holder
fixed position. Based on the date and the position data of backlash adjustment, the
increasing ratio of backlash can be obtained and the next adjustment timing can be
estimated.
4) Be sure to adjust the backlash to an optimum value.
 Excessively large backlash could produce play at worm gears, thus causing vibration
or chattering due to cutting resistance during continuous cutting.
 Excessively small backlash could cause abrasion and seizure of the gear.
5) After the adjustment, be sure to confirm the zero return operation and set the
zero point position.
 The relative engaging position of the worm gears may shift after adjustment, when the
zero point position may also shift very slightly. Set the zero point position again.
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Aligning Phase between the First Spindle and the Second Spindle
of the Rotary Table for the Rotating Axis
Dimension between
reference pins “L”
Reference pin
Reference pin
Main spindle
(Second spindle)
Reference pin hole
Main spindle
(8)
(First spindle)
The procedure in this section should be performed following the procedure in "Adjusting
Worm Gear Backlash of the Rotary Table for the Rotating Axis" (P-56).
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Attach the reference pins to respective pin holes (10H7) on the main spindles for the first
spindle and the second spindle.
 Any backlash at the reference pin will make the measurement error greater. Be sure to use
reference pins with no backlash.
3) Measure the dimension "L" between the reference pins of the first spindle and the second
spindle, and take the measurement as "L0".
 Make one or two turns of the worm spindle in a single direction, measure the dimension
"L0" while keeping the contact side of the worm gear's tooth flank consistent between the
first spindle and the second spindle.
4) Make backlash adjustment.
 It is necessary to disengage the worm spindles of the first spindle and the second spindle
and make backlash adjustment separately.
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5) After backlash adjustment, measure the dimension "L", and take the measurement as "L1".
 Rotate the main spindle (distributor) by hand to make the contact direction consistent, and
measure the dimension "L1". Be careful not to allow the worm spindle to turn.
6) Compare measurements "L0" and "L1", and check that the dimension "L1" is within the
tolerance with respect to the dimension "L0".
7) If the dimension "L1" is greater than the dimension "L0" exceeding the allowable difference,
rotate the worm spindle of the second spindle, and make adjustments until the difference
between dimensions "L1" and "L0" is within the allowable value.
The worm spindles of the first spindle and the second spindle must be disengaged for
adjustment.
 Make the contact side of the worm gear's tooth flank consistent between the first spindle
and the second spindle, and measure the dimension "L1".
1) Keep the contact side of the worm gear's tooth flank consistent for adjustment.
 If the contact side of the worm gear's tooth flank is not consistent between the first
spindle and the second spindle, a difference of angle equivalent to the amount of
backlash is created for phase alignment between the first spindle and the second
spindle.
 Keep either status (A) or status (B) shown below to keep the contact side of the worm
gear's tooth flank.
Worm wheel
Status (A)
Status (B)
Contact side
Worm spindle
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Adjusting Worm Gear Backlash for the Tilting Axis
Worm wheel
For smaller
backlash
Worm spindle
Main body frame
end face
Worm spindle holder
O-ring (G85)
Main body frame
(Tilting axis drive
section)
Cap
Cap fixing bolt
and seal washer
Lock screw
Distance screw
[Instructions]
1) Ensure the working environment suited to the maintenance work, referring to "Auxiliary
Work Accompanying Maintenance Work" (P-2).
2) Refer to "Supplying and Replacing Lubricant" (P-8), and drain lubricant from the tilting
axis drive section.
3) Loosen the cap fixing bolts (2-M6), and remove the cap from the main body frame.
4) Loosen the lock screws on the worm spindle holder evenly to such an extent that the
distance screws will be unfastened.
Lock screw:
Hexagon socket head cap screw
Distance screw: Hexagon socket set screw
(4-M6)
(4-M10)
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5) Loosen the distance screw evenly by the number of turns calculated from the required
amount of adjustment using the following formula.
N = (C  B) / A ........................ Required amount of adjustment
If
If
N > 0, loosen the distance screws.
N < 0, tighten the distance screws.
A: Converted amount of adjustment per rotation of the distance screw at the
measuring position (m)
B: Converted amount at the measuring position for the setting backlash
amount (m)
C: Minimum backlash amount obtained by backlash measurement (m)
Converted amount of adjustment per rotation
of the distance screw
Converted amount of
adjustment in seconds
A
Approx. 103 sec.
Approx. 22 m
Converted amount for the setting backlash amount: B
25 sec.
30 sec.
35 sec.
40 sec.
5 m
7 m
8 m
9 m
Measuring
radius position
45 mm
(90-mm)
Measuring
radius position
45 mm
(90-mm)
6) Tighten the lock screws evenly and slightly, measure the fixed position of the worm spindle
holder, and check that it is below the limit.
 If the worm spindle holder fixed position has reached the limit, the life of the worm gear on
the Rotary Table should be considered as expired and no further adjustment is possible.
In this case, stop conducting the backlash adjustment as well as stop using the Rotary
Table.
Distance limit
1 mm
Worm spindle holder
Fixed position after adjustment
Main body frame end face
Distance limit
M-307-M-A
65
7) Check that there is no clearance between the end face of the distance screw and the main
body frame. If any clearance is observed, try to remove it.
 The sketch below is an illustration of a developed view to show the relation of distance
screws with lock screws, the worm spindle holder and the main body frame.
If there is any clearance between the end face of a distance screw and the main body frame
as shown in the sketch, the worm spindle holder may be inclined when fastening the lock
screws with the designated torque.
Flange section of
worm spindle holder
Main body frame
Lock screw
Distance screw
Clearance
8) Tighten the lock screws (4-M6) evenly with a torque of 13.2 N m and fix the worm spindle
holder.

9) Measure the worm spindle holder fixed position again, and compare the fixed position and
the limit position to determine whether it is usable or not.
10) Refer to "Measuring Worm Gear Backlash" (P-52), and measure the backlash again.
11) When the measured value is not equal to the backlash amount setting, repeat the
adjustment from step 4).
 The optimum backlash cannot be obtained with only one adjustment. Carefully repeat the
adjustment several times.
12) Record the adjustment amount of the worm spindle holder.
13) Set the O-ring (G85), and secure the cap to the main body frame of the Rotary Table.
Be sure to set seal washers to the cap fixing bolts.
14) Refer to "Supplying and Replacing Lubricant" (P-8), and supply lubricant to the tilting
axis drive section.
M-307-M-A
66
1) When tightening the distance screws and lock screws after adjustment, be sure
to use the specified torque and distribute the pressure evenly.
1) NEVER remove any lock screws. Loosen them only to unfasten the distance
screws.
1) When adjusting the backlash, adjust the engaging position of the worm gear so
that the backlash will be minimal.
2) Stop conducting backlash adjustment as well as using the Rotary Table when
the worm spindle holder fixed position reaches the limit.
 If the worm spindle holder fixed position reaches the limit due to backlash adjustment,
the life of the worm gear on the Rotary Table should be considered as expired.
 Before adjusting the backlash, be sure to measure and record the worm spindle holder
fixed position. Based on the date and the position data of backlash adjustment, the
increasing ratio of backlash can be obtained and the next adjustment timing can be
estimated.
3) Be sure to adjust the backlash to an optimum value.
 Excessively large backlash could produce play at worm gears, thus causing vibration
or chattering due to cutting resistance during continuous cutting.
 Excessively small backlash could cause abrasion and seizure of the gear.
4) After the adjustment, be sure to confirm the zero return operation and set the
zero point position.
 The relative engaging position of the worm gears may shift after adjustment, when the
zero point position may also shift very slightly. Set the zero point position again.
M-307-M-A
67
Parts List
Maker List
The parts manufacturers are listed in the "Maker" column of the parts list.
In the case where the parts are commercially available it may be possible to purchase them
directly from the nearest distributor of the relevant parts manufacturer; however, it is strongly
recommended that you purchase the required parts from TSUDAKOMA.
The parts with "*" in the "Maker" column can only be available from TSUDAKOMA.
The parts with "*" and a maker name in parentheses in the "Maker" column may be purchased
from the parts manufacturer. In this case, however, you need to purchase the related
accessories, such as connectors or piping joints, separately. On the contrary, if you purchase
the part from TSUDAKOMA, all the related accessories will be delivered together with the part.
Maker
TSUDAKOMA Corp.
Short Name
*
Azbil Corporation
Azbil
SMC Corp.
SMC
CKD Corp.
CKD
OMRON Corporation
OMRON
Mitsubishi Cable Industries, Ltd.
Mitsubishi Cable
Sakagami Seisakusho Co., Ltd.
Sakagami
NOK Corp.
Morisei Kakou Co., Ltd.
Trellborg Sealing Solutions Japan KK
NOK
Morisei Kakou
Trellborg
ISEL Co., Ltd.
ISEL
Gates Unitta Asia Company
Unitta
Koganei Corporation
Koganei
NTN Corporation
NTN
Nippon Thompson Co., Ltd.
IKO
NACHI-FUJIKOSHI CORP.
NACHI
M-307-M-A
68
Main Body Frame Section
No.
Part name
Description
Q'ty
Maker
1
*
20
Cap
21
O-ring
P18
1
*
25
Plug
R1/4
1
*
30
Cap
1
*
31
O-ring
1
*
35
Cap
2
*
36
O-ring
2
*
P18
P12.5
21
20
30
Remarks
31
25
35
35
36
36
M-307-M-A
69
No.
Part name
Description
Q'ty
Maker
1
*
10
*
50
Side cover (B)
51
Side cover (B)
fixing bolt
52
Packing
1
*
60
Inner cover
1
*
61
Inner cover fixing bolt
(M5  8)
4
*
62
O-ring
G60
1
*
70
Side cover (A)
1
*
71
Side cover (A)
fixing bolt
(M5  12)
8
*
72
O-ring
S215
1
*
80
Lock screw
4
*
81
Distance screw
4
*
90
Cap
1
*
91
Cap fixing bolt
2
*
92
Seal washer
2
*
93
O-ring
1
*
1
*
8
*
8
*
Hexagon socket pan head screw
(M5  16)
Hexagon socket pan head screw
Hexagon socket head cap screw
Hexagon socket head cap screw
(M6  20)
Hexagon socket set screw
(M10  16)
Hexagon socket head cap screw
(M6  18)
G85
100 LS case cover
101
LS case cover
fixing bolt
102 Seal washer
Hexagon socket pan head screw
(M4  8)
Remarks
M-307-M-A
70
No.
Part name
Description
Q'ty
Maker
1
*
103 Packing
Remarks
52
50
51
62
60
61
72
70
71
103
100
101
102
80
81
93
90
91
92
M-307-M-A
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Motor Cover Section for the Tilting Axis
No.
Part name
Description
Q'ty
Maker
1
*
(M6  16)
4
*
S240
1
*
1
*
8
*
212 Seal washer
8
*
213 Packing
1
*
220 Cable connector cover
1
*
8
*
222 Seal washer
8
*
223 Packing
1
*
1
*
200 Motor cover
201 Motor cover fixing bolt
205 O-ring
Hexagon socket head cap screw
210 Maintenance cover
211
221
Maintenance cover
fixing bolt
Cable connector cover
fixing bolt
230 O-ring
Hexagon socket pan head screw
(M4  8)
Hexagon socket pan head screw
(M4  8)
P26
Remarks
M-307-M-A
72
230
205
213
210
211
212
200
201
223
220
221 222
M-307-M-A
73
Motor Cover Section for the Rotating Axis
No.
Part name
Description
Q'ty
Maker
1
*
(M5  16)
4
*
Gs160
1
(Morisei
Kakou)
253 Protective cover
1
*
260 Cable connector box
1
*
8
*
262 Seal washer
8
*
263 Packing
1
*
250 Motor cover
251 Motor cover fixing bolt
Hexagon socket head cap screw
252 O-ring
261
Cable connector box
fixing bolt
Hexagon socket pan head screw
(M4  12)
Remarks
*
252
250
251
253
263
260
262 261
M-307-M-A
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Clamp Confirmation Unit Section and Solenoid Valves for the Rotating Axis
No.
Part name
Description
Q'ty
Maker
300 Limit switch
1
*
310 Pressure case
1
*
311 Piping joint
1
*
320 Stay
1
*
1
*
(CKD)
2
*
340 Connecting pipe
1
*
350 Connecting pipe
1
*
360 Connecting pipe
1
*
330 Solenoid valve
331
(3PA110-M5-L3)
Solenoid valve
fixing bolt
Cross-recessed pan head screw
(M2.5  8)
Remarks
310
340
360
300
330
320
311
350
331
310
M-307-M-A
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Clamp Confirmation Unit Section and Solenoid Valves for the Tilting Axis
No.
Part name
Description
Q'ty
Maker
1
*
(M3  25)
2
*
VK332Y-5DZ-M5-Q
1
*
(SMC)
Cross-recessed pan head
screw
2
*
(SMC)
1
*
2
*
1
*
2
*
400 Clamp confirmation unit
Cross-recessed pan head screw
401 Cylinder fixing bolt
410 Solenoid valve
411
Solenoid valve
fixing bolt
420 Bracket
Hexagon socket head cap screw
421 Bracket fixing bolt
(M6  10)
430 Quick exhaust
431
Quick exhaust
fixing bolt
431
Hexagon socket head cap screw
(M4  20)
Remarks
430
400
401
411
420
410
421
M-307-M-A
76
ZRN Deceleration Signal Unit Section for the Rotating Axis
No.
Part name
500 Proximity switch
Description
Q'ty
Maker
EB21318K
(FL7M-2J6HD)
1
*
(Azbil)
M8
1
*
(Azbil)
Die thread
DT-1-8
1
(Mitsubishi
Cable)
1
*
P12
1
*
Hexagon head bolt
(M5  10)
1
*
501 Nut
502 Seal washer
510 Holder
511 O-ring
520 Holder fixing bolt
Remarks
*
500
501
502
510
520
511
M-307-M-A
77
ZRN Deceleration Signal Unit Section for the Tilting Axis
No.
Part name
Description
Q'ty
Maker
EB21319
(FL7M-3K6H-919)
1
*
(Azbil)
M12
1
*
(Azbil)
610 Holder
1
*
611 Push ring
1
*
600 Proximity switch
601 Nut
612 O-ring
AS568-205A
1
*
613 O-ring
P16
1
*
1
*
1
*
Hexagon socket head cap screw
620 Holder fixing bolt
(M6  10)
621 Washer
Remarks
600
601
611
612
610
613
620
621
M-307-M-A
78
Overtravel Prevention Unit Section for the Tilting Axis
No.
Part name
Description
Q'ty
Maker
EB06160-80
(LJM-D2502L1)
2
*
(Azbil)
4
*
702 Washer
4
*
710 Switch base
1
*
4
*
700 Limit switch
701 Limit switch fixing bolt
711 Switch base fixing bolt
Hexagon socket head cap screw
(M4  16)
Hexagon socket head cap screw
(M6  10)
Remarks
701
702
710
711
700
M-307-M-A
79
Motor Section for the Rotating Axis
No.
Part name
Description
800 Pinion gear
810 Motor fixing bolt
Hexagon socket head cap screw
(M6  16)
811 Spring washer
820 O-ring
S80
Q'ty
Maker
1
*
4
*
4
*
1
*
Remarks
800
820
811
810
M-307-M-A
80
Motor Section for the Tilting Axis
No.
Part name
Description
850 Pinion gear
Hexagon socket head cap screw
860 Motor fixing bolt
(M6  16)
861 Spring washer
870 O-ring
S80
Q'ty
Maker
1
*
4
*
4
*
1
*
Remarks
850
870
861
860
M-307-M-A
81
Accessory
No.
Part name
Description
Q'ty
Maker
4
*
8
*
910 Clamping bolt set
3
*
920 Clamping block set
4
*
930 Guide block
2
*
2
*
900 Plate
Hexagon socket head cap screw
901 Plate fixing bolt
(M10  25)
931 Guide block fixing bolt
910
Hexagon socket head cap screw
(M6  12)
Remarks
920
900
901
930
931
M-307-M-A
82
Troubleshooting
Category of Troubles
If any status which signifies trouble occurs during operation, check the items described in this
chapter and take appropriate measures according to the classifications below. If trouble other
than the described occurs, contact your distributor (or machine tool manufacturer) or us for
further information.
Category
Cause and Solution
A
Problems originating other than with the Rotary Table
B
Problems originating within the Rotary Table or something
connected to the Rotary Table and problems which can be
handled by maintenance personnel
(B)
C
Problems of which the origin cannot be categorized under A, B,
or C until a detailed check is conducted
The detailed check must be conducted by maintenance
personnel.
Severe problems originating within the Rotary Table
Contact your distributor (or machine tool manufacturer), or
contact us directly.
When "A" is indicated in the "Category" column, refer to the machine tool instruction manual
and the Setup Manual for the Rotary Table (this Manual).
For "B" in the "Category" column, refer to the Setup Manual and the Maintenance Manual for
the Rotary Table.
M-307-M-A
83
Trouble Condition and Measures
Trouble condition 1.
The Rotary Table does not operate with no overcurrent
alarm issued.
Possible causes
Category
The interface cables between the Rotary
Table and the control unit are not connected.
A
Check that the interface cables are
properly connected.
A
Check the continuity of the interface
cables, and replace the cables if
necessary.
The interface cables between the Rotary
Table and the control unit are disconnected.
Trouble condition 2.
Measures
The Rotary Table does not operate with an overcurrent
alarm issued.
Possible causes
The operation program is not valid.
(Clamp command input error)
Category
A
Measures
Check the program.
(Review interlock.)
Clamping force of the main spindle is not
released due to malfunction of the clamp unit
section.
(B)
Refer to "Trouble condition 5".
The motor output torque is exceeded due to
an overload.
A
Change to a moderate load
according to the specifications.
The working temperature is not within the
allowable range.
A
Keep the working temperature
within the allowable range.
Foreign matter might be mixed in lubricant
during oiling and interfere with the gear.
(Abnormal sound will be produced at the start
of operation but stop soon in this case.)
B
Supply lubricant until foreign matter
comes out from the drain port.
Gear rotation is hindered due to damage to
the gears.
(The gear case will rumble loudly, or the
motor may buzz in this case.)
C
Stop using the Rotary Table
immediately.
The gear has seized up due to insufficient or
deteriorated lubricant.
(The motor will buzz at the start of rotation in
this case.)
C
Stop using the Rotary Table
immediately.
M-307-M-A
84
Trouble condition 3.
The main spindle of the rotating axis or tilting axis does
not rotate smoothly and produces an abnormal sound.
Possible causes
The motor output torque is exceeded due to
an overload.
Smooth rotation is hindered due to
insufficient or deteriorated lubricant.
Clamping force of the main spindle is not
released due to malfunction of the clamp unit
section.
Category
Measures
A
Change to a moderate load
according to the specifications.
B
Check the lubricant level, its
viscosity and the date of the latest
replacement.
(B)
Refer to "Trouble condition 5".
The backlash amount is not appropriate.
B
Adjust the backlash amount to an
optimum value.
Foreign matter might be mixed in lubricant
during oiling and interfere with the gear.
(Abnormal sound will be produced
repeatedly during rotation.)
B
Supply lubricant until foreign matter
comes out from the drain port.
The gears are damaged and produce an
abnormal sound.
(Abnormal sound will be produced
repeatedly during rotation.)
C
Stop using the Rotary Table
immediately.
M-307-M-A
85
Trouble condition 4.
Chattering occurs during cutting.
Possible causes
Category
Measures
Excessive cutting force is added during
machining.
A
Change the cutting conditions
properly according to the
specifications.
The Rotary Table is not secured correctly.
B
Check fixing bolts and fixtures for
tightness.
The workpiece or fixture is not mounted
correctly.
(B)
Check the mounting condition and
correct it as required.
Clamp command input error
(The clamp command is not executed.)
 Except during continuous cutting
A
Clamping force is insufficient.
 Except during continuous cutting
(B)
Check the program.
Refer to "Trouble condition 5".
Smooth rotation is hindered due to
insufficient or deteriorated lubricant.
 Only during continuous cutting
B
Check the lubricant level, its
viscosity and the date of the latest
replacement.
The backlash amount is not appropriate.
 Only during continuous cutting
B
Adjust the backlash amount to an
optimum value.
The worm spindle section is not fixed
correctly after backlash adjustment.
B
Conduct adjustment again.
Because the worm spindle coupling of the
first spindle or the second spindle is not
engaged properly, slippage occurs.
B
Check the engagement of the
coupling.
A part within the Rotary Table has done its
term of service and results in malfunctioning.
C
Stop using the Rotary Table
immediately.
M-307-M-A
86
Trouble condition 5.
The main spindle of the rotating or tilting axis cannot be
clamped or clamping force cannot be released.
Possible causes
Category
Measures
Clamp command input error
(The clamp command is not executed.)
A
Check the program.
The switch of the clamp confirmation unit is
faulty.
B
Check the clamp confirmation unit,
and replace the proximity switch.
Clamping pressure is insufficient because
pneumatic piping is damaged.
A
Replace the defective pipe with a
new one.
The pneumatic pressure is lower than the
specified value.
A
Change the pressure level properly
according to the specifications.
Piping is not connected correctly, resulting in
malfunctioning.
B
Check the piping.
Clamping pressure is insufficient because
the connecting pipe is damaged.
B
Replace the defective pipe with a
new one.
The exhaust port of the motor cover is
blocked so the back pressure is applied to
the outlet port of the solenoid valve.
A
Check the exhaust port and remove
the blocking object.
The solenoid valve is faulty.
B
Replace the solenoid valve with a
new one.
The main spindle clamp unit is
malfunctioning.
C
Stop using the Rotary Table
immediately.
The main spindle or the main body frame is
damaged or a part within the Rotary Table
has done its term of service and results in
malfunctioning.
C
Stop using the Rotary Table
immediately.
M-307-M-A
87
Trouble condition 6.
Indexing accuracy is faulty.
Possible causes
Category
Measures
The operation program is not valid.
(An indexing angle command error)
A
Check the program.
An overload is being applied during
operation.
A
Change to a moderate load
according to the specifications.
The zero point position is not set correctly
due to improper grid shift amount.
A
Check the zero point position and
the grid shift amount.
ZRN dog position adjustment is faulty.
B
Adjust the ZRN dog position.
B
Check the ZRN deceleration signal
unit section, and replace the
proximity switch.
The ZRN deceleration signal unit is
malfunctioning.
 The proximity switch is defective.
Clamping operation is faulty.
(B)
Refer to "Trouble condition 5".
The worm spindle section is not fixed
properly after adjustment.
B
Conduct adjustment again.
Because the worm spindle coupling of the
first spindle or the second spindle is not
engaged properly, slippage occurs.
B
Check the engagement of the
coupling.
The main spindle or the main body frame is
damaged or a part within the Rotary Table
has done its term of service and results in
malfunctioning.
C
Stop using the Rotary Table
immediately.
M-307-M-A
88
Trouble condition 7.
The workpiece or something collides with the machine
tool when it is tilted.
Possible causes
Category
Measures
The tilting angle is in the appropriate range;
however, the workpiece is too large, which
causes a collision.
A
Use the Rotary Table within the
workpiece size and shape that
conform to the specifications.
The load, such as workpiece, has exceeded
its allowable maximum, so the motor cannot
stop within the specified angle range.
A
Review the workpiece conditions.
The overtravel prevention unit signal is faulty.
 A limit switch is faulty.
B
Check the overtravel prevention unit
section, and replace the limit switch.
The mounting direction of the limit switch for
the overtravel prevention unit is not correct
so the tilting angle of the overtravel
prevention unit is out of the specification
value.
B
Correct the limit switch mounting
condition.
M-307-M-A
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