MY1C Series Rodless Cylinder
Series MY1C
Agenda
•What is a Rodless Cylinder?
•Sizing and Moments
•Features and Benefits
•Maintenance
Series MY1C
What is a Rodless Cylinder?
Pneumatic rodless cylinders, including the
mechanical joint type MY1C Series, were
developed to provide linear motion with
minimum space requirements. They are a
low cost alternative to the much higher priced
electrically driven linear slides commonly
referred to as “servos”.
Series MY1C
What is a Rodless Cylinder?
Space savings - 1/2 the overall length of a
conventional cylinder
Rodless Cylinder
5’ stroke
5’ stroke
Conventional Cylinder
Additional 5’
Series MY1C
What is a Rodless Cylinder?
An internal piston drives the slider block which is
coupled by a “floating” mechanical joint.
Slider Block
Mechanical Joint
Piston
Series MY1C
What is a Rodless Cylinder?
Guides are incorporated for load carrying
capability
The MY1C series
uses a Cam Follower
Guide for High Loads
and a Table Accuracy
of +/- 0.05mm
The MY1C is not just
a cylinder. It is an
engineered product
Series MY1C
Sizing and Moments
There are 3 main axes of
movement, PITCH, YAW, and
ROLL.
PITCH
In determining the forces on an
actuator, proper selection
requires an understanding and
calculation of these forces --referred to as specific moments,
or:
M1
PITCH
M2
YAW
M3
ROLL
SMC Training
Sizing and Moments
M1
PITCH
These moments are categorized as
M1, M2, and M3; illustrating forces
that are part of the process.
Side view
M3
Rodless Cylinders are selected when
extreme precision is required --holding tolerance throughout full
stroke--- in spite of moments that
would deflect normal cylinders.
YAW
W
Top view
M2
ROLL
End view
SMC Training
Sizing and Moments
M1
PITCH
Side view
Sometimes the moment is eccentric (off centerline) and this poses
additional calculations and concerns. Consult the catalog for
assistance in determining what moments are acceptable for each
bore within an MY series…. you must know the application.
M3
YAW
Top view
W
M2
ROLL
End view
SMC Training
MY1C Series Feature and Benefits
•7 Bores sizes - 16 ~ 63mm bore
•Stroke ranges from 100 ~ 5000mm
•Repairable
•Precise Cam Follower Guide system
•Centralized piping
•Stroke adjusting units with hard stops or
shock absorbers
•Autoswitch capable
•Adjustable air cushions
•“Floating joint” mechanical connection
between the piston and slide table
The MY1C is one in a family of seven
different mechanically coupled rodless
cylinders:
•MY1B- Basic
•MY1M- Slide Bearing
•MY1C- Cam Follower Guide
•MY1H- High Precision Guide
•MY2H- L.P. High Precision Guide
•MY2HT- L.P. Dual High Precision Guide
•MY1TH- Heavy Duty
•Side Supports
•Debris Cover
Series MY1C
Construction
Series MY1C
Preventive Maintenance
•Filtration - Always 5 micron or better, no oil or lubricant
•Grease - Apply grease (Lithium Soap Based - See Text)
monthly to all bearing contact surfaces and to the dust
seal band
•Tightening or Replacement of the Dust Seal Band - The
Dust Seal can stretch over time, and needs to be
tightened or replaced. (Note standard and wide bands)
•Leakage- Leakage is inherent to mechanically coupled
rodless cylinders due to their design. A small amount of
air leakage (300 Ncc/min or 0.3 l/min) is expected.
Series MY1C
Repair Kits
Dust Seal Band
Part Number:
MY1M32-PSS2.5, Std. Width, 2.5m
MY1M32-PSS5.5, Std. Width, 5.5m
MY1M32-PSW2.5, Wide width, 2.5m
MY1M32-PSW5.5, Wide width, 5.5m
*Includes grease and and set screws
Note:
The dust seal band can be ordered in two different widths, a standard, and a wide band. The grooves
in the cylinder tube extrusions vary, and must be measured before assembly.
To identify band width check the set screws that hold the band in place. If they are black, then use the
standard band. If they are silver, then use the wide band.
If this dimension is larger than 15.2mm, then
use the wide band,
Series MY1C
Repair Kits
Seal Belt
Part Number:
MY1M32-PSB2.5, 2.5m
MY1M32-PSB5.5, 5.5m
*Includes grease and belt clamps
Series MY1C
Repair Kits
Seal Kit
Part Number: MY1M32-PSQ
*Includes tube gaskets, piston seals, cushion seals
grease and belt clamps.
Table End Cover Kit
Part Number: MY1M32-PSC
*Includes scrapers, grease, end covers
stoppers, spacers, and screws.
Series MY1C
Dust Seal Band Maintenance
Tightening the Dust Seal Band
Disassembly
•Loosen the two set screws on one of the head covers. This will allow one
end of the dust seal band to “float”
Adjustment
•Cycle the cylinder’s slide table by hand three or four times, and return the
table to the end were the dust seal band is not fixed. During the last stroke
slide your thumb across the dust seal band to remove any slack.
Series MY1C
Dust Seal Band Maintenance
Tightening the Dust Seal Band - con’t
Assembly
•Tighten the two remaining set screws to fix the dust seal band.
•Cycle the cylinder’s table by hand to see if there is any slack. If slack is
present the band needs to be replaced.
•If the band is ok, then uniformly apply Lithium Soap based grease to the
band. Cycle, and remove any excess grease.
Series MY1C
Seal Band Maintenance
Replacing the Dust Seal Band, and the Seal Belt
Disassembly
•Loosen the four set screws on both of the head covers.
•Remove the belt clamps
•Remove both head covers
•Remove the two slide table end covers
•Slowly pull out the dust seal band
•Slide the table and piston assy. to one end of the
cylinder. Do not remove the table and piston, or it will need to be adjusted.
•Pull out the seal belt
Assembly
•Tighten the two remaining set screws to fix the dust seal band.
•Cycle the cylinder’s table by hand to see if there is any slack. If slack is
present the band needs to be replaced.
•If the band is ok, then uniformly apply Lithium Soap based grease to the
band. Cycle, and remove any excess grease.
Series MY1C
Seal Band Maintenance
Replacing the Dust Seal Band, and the Seal Belt
Installing the Seal Belt
•Cut the new seal belt to the combined length of the cylinder + end caps +
piston assy. (Remember, longer is better!)
•Apply a layer of grease to the seal belt and fill it’s groove
•Slide the seal belt into the cylinder tube extrusion through the belt guide on
the piston. Also, the extra belt length should project equally from both
sides.
Belt Guide
•Move the slide table and piston to the opposite end of the cylinder tube.
This should seat the seal belt into the tube extrusions groove.
•Remove excess grease.
Series MY1C
Seal Band Maintenance
Replacing the Dust Seal Band, and the Seal Belt
Installing the Dust Seal Belt
•Cut the new seal belt to the combined length of the cylinder + end caps +
piston assy.
•Insert the new dust seal band (metallic side up) over the seal belt, and
between the piston and table assy.
•Insert the dust seal band in the recess in the tube with light finger pressure
across the entire length of the cylinder tube.
•Cycle the cylinder’s slide table by hand three or four times, and return the
table to the end were the dust seal band is not fixed. During the last stroke
slide your thumb across the dust seal band to remove any slack.
•Cut the excess dust seal band leaving 10~15mm passed the two set screws
in the end cover
•Uniformly apply Lithium Soap based grease to the band.
Series MY1C
Seal Band Maintenance
Replacing the Dust Seal Band, and the Seal Belt
10 mm - 15 mm
Rubber backing
Dust seal band (metal)
Hint:
Trim the rubber backing
10 ~ 15mm so the band will fit
underneath the set screws
Before Cutting
Caution!:
Just trim one side to begin with!
Dust seal band (metal)
After Cutting
Series MY1C
Seal Band Maintenance
Replacing the Dust Seal Band, and the Seal Belt
•Install the side table’s
end cover(s) so there is
a 1mm clearance
between the cover(s)
and the dust seal belt
1 mm
Clearance
Series MY1C
Seal Band Maintenance
Replacing the Dust Seal Band, and the Seal Belt
•Insert the seal belt and dust seal band into the head cover in
corresponding locations
•Install the head covers into the tube extrusion with a slight
rocking motion.
•Thread the socket head cap screws into the head cover by
hand. Do not tighten yet.
•Place the cylinder on a flat plate and align the head covers.
tighten the socket head cap screws.
•Trim any excess seal belt and dust seal band.
•Place the belt clamp into the slot in the head cover.
•Tighten the four set screws on one side of the cylinder.
•Cycle the cylinder’s slide table by hand 3 or 4 times, and
return the table to the end were the dust seal band is not fixed.
During the last stroke slide your thumb across the dust seal
band to remove any slack.
•Install the belt clamp, and tighten the 4 set screws on the other
side of the cylinder.
Series MY1C
Seal Replacement
Important! When replacing the piston and cushions seals do not remove the piston
from the cylinder tube. Also do not move the table past the cam follower rails. Failure
to follow these direction will result in the table needing to be readjusted.
To replace the tube seal, remove the
Seal goes
end cap and insert a new seal.
here
Reassemble following the same
instructions for dust seal replacement.
Seals go
here
To replace the piston and cushion seals, remove
both end caps, and side the piston to each end of
the cylinder. This will allow access to the seals
without removing the piston and table from the
cylinder. Reassemble following the same
instructions for dust seal replacement.
Series MY1C
Slide Table Adjustment
Adjusting the slide table is a “non-standard” procedure, and should not need to be done.
However, information is available in the MY1C Operations Manual to perform this adjustment .
CAMS
Adjusting Gear
(Slotted)
Set Screw
(Hex Head)
Series MY1C
Series MY1C