Turning
Thread turning
Turning screw
threads ...
A
... are common operations on CNCmachinery and is today performed with
high productivity and production security
mainly through the use of indexable inserts. Inserts are available with cutting
edges in the shape of the appropriate
thread forms, for example Metric, UN,
Whitworth.
B
The feed rate of the machine is the key
factor for turning threads as this has to
equal the pitch of the thread. This means
a high feed rate in threading with modern
indexable inserts, which are also capable of high cutting speeds. The co-ordination between the thread pitch and the
feed rate per revolution is facilitated by
sub-routines in CNC machines.
C
D
Thread turning is performed through the
indexable insert tool making a number
of passes along the section of the workpiece to have a screw thread. By dividing
the full cutting depth of the thread into
smaller cuts, the sensitive, thread-profile
point of the cutting edge is not overloaded. By taking a fraction of the threaddepth per cutting depth at each pass,
the profile depth of the thread is turned
in typically six passes. The recommended infeed values decrease successively
as the insert cuts deeper, engaging more
and more of the cutting edge whilst generating more and more of the profile.
E
F
G
H
C1
Turning
n
πxD
φ3
p
A
fn
φ
π x D3
π x D2
D
C
D
E
F
The geometrical shape of the
screw thread ...
... is based on the diameter (d) of the
thread and the pitch (p) : the distance
axially on the component, from one point
or valley on the profile to the corresponding next point along the thread. This
can also be seen as a triangle being unwound from the component, where the
long base is the same as the circumference of the workpiece and the height is
the pitch. The angle of this triangle is called the helix angle of the screw thread.
The hypotenuse of the triangle forms the
helix that winds round the workpiece and
defines the thread. The diameter in combination with the pitch will, therefore, indicte the definition of the thread.
Various infeed types
There are three different methods of feeding the insert in during each pass. All arrive at the same profile but the cuts are
made differently, with varying influences
on : chip formation, tool wear and quality.
The radial infeed (A) is the conventional
way, used widely where the insert is fed
in at a right angle to the workpiece and
the chip is formed stiffly into a V on both
G
sides of the profiled cutting edge. Tool
wear is more even on both sides of the
insert and the method is more suitable
for fine pitches and work-hardening materials.
The modified flank wear (B) is an advantageous method for modern thread
turning and CNC lathes are programmed
to have this method in cycles. The insert
is fed in at the angle of the profile less
a clearance angle. Clearance behind the
cutting point, as in ordinary turning, has
to be provided for in the feed direction.
Chip control is better, the process being
more similar to ordinary turning and for
using chipbreaker threading inserts, type
geometry C. Less heat is generated in
the insert point and production security
is generally high with this method. Vibration tendencies, as might arise in coarse
threads or when long length of contact
is involved, can be reduced with flank infeeding.
Incremental type feed (C) is the method
used mainly for large profiles. The insert
cuts in varying increments into the profile.
This gives rise to more even insert wear.
One side of the thread profile is turned in
A
H
Infeed types: radial, modified flank and incremental.
C2
φ1
p
The screw thread and its components.
B
φ2
B
π x D1
a few increments, the tool is then advanced and the other side of the profile is turned in a few increments and so on until
the full profile has been generated.
Very large thread profiles can also be premachined with a turning tool (type MTEN)
having a triangular insert pointed into the
thread profile. The finishing passes are
taken with the thread-turning insert.
Pre-machining large threads.
C
Turning
Selecting infeed type
There are three different types of infeed: radial, flank and incremental.
In practice the machine tool, workpiece material, insert geometry and thread pitch determine the choice of infeed method.
Radial infeed
A
Most commonly used and the only possible method in many
mechanical machine tools. Gives soft chipforming and even
wear on the insert. Suitable for fine pitches. Risk of vibration
and bad chip control when used for coarse pitches. First choice
in work hardening materials, e.g. austenitic stainless steel.
The C-geometry will not give chipbreaking with radial infeed.
B
Recommendations for radial infeed are given in the tables.
C
Modified flank infeed
How to steer the chip
The axial movement between infeeds can be calculated simply
as 0.5 x the radial infeed (ap) for a 60° flank angle. The equivalent for a 55° flank angle should be 0.42 x the radial infeed.
This gives an infeed angle which is 5° less than the flank angle
of the thread.
Gives better chip control when the chip can be steered either
way. Suitable for coarse threads and for internal threading
when problems with chip evacuation and vibrations occur. To
avoid bad surface or excessive flank wear due to rubbing of
trailing edge, the infeed angle should be 3–5° smaller than the
angle of the thread.
C-geometry
For C-geometry insert, modified flank infeed is the only suitable
infeed. Infeed angle of 1° should be used.
Feed direction
D
E
F
fn
G
H
Incremental infeed
Mainly used when machining large profiles. This method gives
even insert wear and long tool life.
Requires special programme on CNC machines.
Steer the chip out of the hole by selecting the most suitable infeed method.
C3
Turning
Optimizing tool-life and threading economy
Infeed recommendations for the different geometries
All-round geometry
F-geometry
C-geometry
A
B
1°
3 – 5°
Modified flank infeed
3 – 5°
Radial infeed
C
Temperature
Modified flank infeed 1°
Careful observations pay dividends
C°
Careful observations of the insert after a threading operation
will often provide information which will allow you to achieve
the best possible threading economy with regard to tool life,
thread quality and optimum cutting speed.
D
At low speeds built-up-edge is the main problem, at high speeds
plastic deformation of the tip is the problem.
C°+
E
Incremental infeed
C°–
120
Cutting speed
vc m/min
F
Chip breaking in threading
Threading and particularly chip control in threading is often a
problem in machines with limited supervision, even if it is the
last operation. Chips often coil around robots, chucks, tools
and components. They fasten in conveyors causing damage
and loss of productive machining time.
G
The chip breaking C-geometry allows threading to be treated
more like a normal turning operation. It gives a process which
is fully under control with no chip snags and hence predictable
tool life and thread quality. The chip which is produced by the
edge is very thin and easily formed. If the surface produced by
the secondary cutting edge is not of satisfactory quality the last
pass can be made radially.
H
The C-geometry is symmetrical which means that it can be used for flank infeed
on both sides of the flank. If modified flank infeed is used it works best with an
angle of about 1°.
C4
Turning
Infeed passes - number and sizes
The number of passes and size of infeed can have a decisive impact on the threading
operation. In most modern machine tools, the total thread depth and the first or the
last cutting depth should be given in the threading cycle.
To improve the machining result the following infeed recommendations should be
used. For Multi point inserts it is essential that the infeed recommendations are followed.
The recommendations are intended as starting values. The most suitable number of
passes must be determined by trial and error.
A
– For optimal tool life the workpiece diameter should not be more than 0.14 mm
larger than the max. diameter of the thread.
– Infeeds of less than 0.05 mm should be avoided.
– For austenitic stainless steel, infeed less than 0.08 should be avoided.
B
C
Two approaches to further improve the machining result
➀ A reduced series — to give constant chip area
This involves a relatively large start value 0.2 - 0.35 mm, depending on the depth
of the thread profile. The values decline progressively and finish at 0.09 - 0.02
mm. The last pass can be a spring pass which is a pass without infeed, the reason for which is that recoil in the machine can be taken up. Spring passes are
not recommended with C-geometry inserts because they lead to poor chip control.
This type of series is the most common on modern CNC machines and is the type
of series normally used with the modern C-geometry.
➁ A constant infeed series — to obtain the best possible chip control and tool life
A method which is becoming more common with new machines. By fixing one of
the parameters in the threading cycle the chip thickness is fixed and hence chip
forming can be optimized. A start value should be approximately 0.18 - 0.12 mm
but the actual value should be guided by the value for the last pass which should
be at least 0.08 mm.
EXAMPLE:
ISO metric external: Pitch 2.0 mm
Total depth of infeed = 1.28 - 0.08 = 1.20 = 10 passes + 1 (0.08) = 0.12 mm
infeed/pass.
D
E
Chip area + spring pass
F
G
Cutting data for partial profile inserts (V-profile 55° and 60°)
When threading with partial profile inserts the recommended number of passes can
be used. However, the infeed per pass must not exceed the largest recommended
infeed value when using an insert with the smallest pitch.
Constant infeed
H
Note!
When closer thread tolerances are needed a last pass without infeed (spring pass)
may be used. For hard materials the number of passes should be increased.When
threading work-hardening materials, e.g. stainless austenitic steel, the infeed should
not be less than 0.08 mm.
When using grade CB20. the max. infeed value should be 0.07 mm.
C5
Turning
Formulas
Formula to calculate infeed for each pass in a reduced series.
∆apx=
A
ap
√
nap –1
×
√
φ
∆ap
Radial infeed
x
Actual pass (in a series from 1 to nap)
ap
Total depth of thread.
nap
Number of passes.
φ
1st pass
= 0.3
2nd pass
= 1
3rd and higher passes
= x–1
B
C
Example:
Conditions:
External threading.
D
Pitch:
1.5 mm
ap:
0.94 mm
nap:
6 passes
Calculations:
∆ap 1
=
∆ap 2
=
∆ap 3
=
∆ap 4
=
∆ap 5
=
∆ap 6
=
0.94
√5
0.94
√5
Results:
×
√ 0.3
=
0.23
1st pass, infeed
= 0.23 mm
×
√1
=
0.42
2nd pass, infeed
0.42 – 0.23 = 0.19 mm
×
√2
=
0.59
×
√3
=
0.73
4th pass, infeed
0.73 – 0.59 = 0.14 mm
×
√4
=
0.84
5th pass, infeed
0.84 – 0.73 = 0.11 mm
×
√5
=
0.94
6th pass, infeed
0.94 – 0.84 = 0.10 mm
E
F
G
H
See also infeed values recommendations.
C6
0.94
√
5
0.94
√5
0.94
√
5
0.94
√
5
3rd pass, infeed
0.59 – 0.42 = 0.17 mm
Turning
Infeed recomendations
Dimensions x and z
ap = total depth of thread
nap = number of passes
Pitch
mm
Total infeed
t.p.i.
ap
nap
x
Pitch
mm
z
Metric 60°
UN 60
External
R/L166.0G-16MM01
Internal
R/L166.0L-11UN01
Multi-point inserts, see table.
R/L166.0G-22MM01
Internal
R/L166.0L-11MM01
Multi-point inserts, see table.
R/L166.0L-16MM01
R/L166.0L-22MM01
0.50
0.75
0.80
1.00
1.25
1.50
1.75
2.00
2.50
3.00
0.34
0.50
0.54
0.67
0.80
0.94
1.14
1.28
1.58
1.89
4
4
4
5
6
6
8
8
10
12
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
0.5
0.5
0.6
0.8
0.8
1.0
1.2
1.4
1.4
1.8
3.50
4.00
4.50
5.00
5.50
6.00
2.20
2.50
2.80
3.12
3.41
3.72
12
14
14
14
16
16
1.67
1.67
1.67
1.38
1.08
0.88
2.5
2.5
2.5
2.5
2.5
2.8
0.50
0.75
1.00
1.25
1.50
1.75
2.00
0.34
0.48
0.63
0.77
0.90
1.07
1.20
4
4
5
6
6
8
8
0.72
0.72
0.72
0.72
0.72
0.72
0.72
0.5
0.6
0.8
0.8
1.1
1.05
0.92
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.50
3.00
0.34
0.48
0.63
0.77
0.90
1.07
1.20
1.49
1.77
4
4
5
6
6
8
8
10
12
1.30
1.30
1.30
1.30
1.30
1.30
1.30
1.30
1.30
0.5
0.5
0.8
0.8
1.0
1.2
1.4
1.4
1.8
3.50
4.00
4.50
5.00
5.50
6.00
2.04
2.32
2.62
2.89
3.20
3.46
12
14
14
14
16
16
1.64
1.64
1.64
1.35
1.06
0.87
2.5
2.5
2.5
2.5
2.5
2.4
Multi-point inserts, see table.
R/L166.0G-22UN01
Multi-point inserts, see table.
R/L166.0L-16UN01
R/L166.0L-22UN01
32
28
24
20
18
16
14
13
12
11
10
9
8
0.52
0.62
0.71
0.83
0.93
1.03
1.17
1.26
1.36
1.48
1.63
1.79
2.01
4
5
5
6
6
7
8
8
8
9
10
11
12
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
0.5
0.8
0.8
0.8
1.0
1.0
1.2
1.4
1.4
1.4
1.4
1.8
1.8
7
6
5
41/2
4
2.28
2.66
3.19
3.52
3.96
12
14
14
16
16
1.67
1.67
1.38
1.09
0.79
2.5
2.5
2.5
2.65
2.9
*) Include 0.03 - 0.07 mm stock above the crest.
Total infeed
x
z
4
5
5
6
6
7
8
0.72
0.72
0.72
0.72
0.72
0.72
0.72
0.6
0.8
0.85
0.9
1.00
1.00
1.05
0.49
0.59
0.66
0.78
0.86
0.95
1.10
1.17
1.26
1.38
1.49
1.66
1.86
4
5
5
6
6
7
8
8
8
9
10
11
12
1.30
1.30
1.30
1.30
1.30
1.30
1.30
1.30
1.30
1.30
1.30
1.30
1.30
0.5
0.8
0.8
0.8
1.0
1.0
1.2
1.4
1.4
1.4
1.4
1.8
1.8
2.11
2.44
2.93
3.27
3.65
12
14
14
16
16
1.64
1.64
1.35
1.06
0.87
2.5
2.5
2.5
2.5
2.6
0.64
0.68
0.87
0.91
1.07
1.12
1.23
1.42
1.54
1.69
1.87
2.09
5
5
6
6
7
8
8
8
9
10
11
12
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
0.8
0.8
0.8
0.8
1.0
1.0
1.4
1.4
1.4
1.4
1.8
1.8
2.41
2.80
3.34
3.70
4.15
12
14
14
16
16
1.67
1.67
1.38
0.99
0.59
2.5
2.5
2.5
2.65
2.75
t.p.i.
ap
nap
32
28
24
20
18
16
14
0.49
0.59
0.66
0.78
0.86
0.95
1.10
32
28
24
20
18
16
14
13
12
11
10
9
8
7
6
5
41/2
4
A
B
C
D
Whitworth
External
R/L166.0G-16WH01
Multi-point inserts, see table.
R/L166.0G-22WH01
UN 60°
External
R/L166.0G-16UN01
Dimensions x and z
ap = total depth of thread
nap = number of passes
28
26
20
19
18
16
14
12
11
10
9
8
7
6
5
41/2
4
E
F
Internal
R/L166.0L-11WH01
20
19
14
0.87
0.91
1.23
6
6
8
0.72
0.72
0.72
0.9
0.9
1.05
R/L166.0L-16WH01
28
26
20
19
18
16
14
12
11
10
9
8
0.64
0.68
0.87
0.91
1.07
1.12
1.23
1.42
1.54
1.69
1.87
2.09
5
5
6
6
7
8
8
8
9
10
11
12
1.30
1.30
1.30
1.30
1.30
1.30
1.30
1.30
1.30
1.30
1.30
1.30
0.8
0.8
0.8
0.8
1.0
1.0
1.2
1.4
1.4
1.4
1.8
1.8
Multi-point inserts, see table.
G
H
For each thread profile depth, see ordering part for Hc value
C7
Turning
Dimensions x and z
ap = total depth of thread
nap = number of passes
nap = number of passes
Total infeed
Pitch
mm
t.p.i.
A
ap
nap
x
2.41
2.80
3.34
3.70
4.15
12
14
14
16
16
1.64
1.64
1.35
0.96
0.67
2.5
2.5
2.5
2.65
2.75
27
18
14
111/2
8
0.76
1.12
1.43
1.74
2.49
6
8
10
12
15
1.03
1.03
1.03
1.03
1.03
0.8
1.0
1.2
1.4
1.6
R166.0L-11NT01
18
14
1.12
1.43
8
10
0.72
0.72
0.85
0.95
R/L166.0L-16NT01
14
111/2
8
1.43
1.74
2.49
10
12
15
1.01
1.01
1.01
1.2
1.4
1.6
External
R/L166.0G-16NT01
Multi-point inserts, see table.
Multi-point inserts, see table.
D
External
R/L166.0G-16NF01
6
8
10
12
16
1.03
1.03
1.03
1.03
1.03
0.8
1.0
1.2
1.4
1.6
14
111/2
8
1.43
1.71
2.46
10
12
16
1.01
1.01
1.01
1.2
1.4
1.6
0.94
1.23
6
8
1.32
1.32
1.0
1.4
0.53
0.59
0.68
0.80
0.89
0.99
1.12
1.29
1.54
1.92
4
5
5
6
6
7
8
8
10
12
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
1.32
0.5
0.8
0.8
0.8
1.0
1.0
1.2
1.4
1.4
1.8
1.50
2.00
3.00
0.90
1.25
1.75
6
8
12
1.37
1.37
1.27
1.0
1.1
1.6
R/L166.0G-22TR01
4.00
5.00
6.00
7.00
2.24
2.73
3.49
3.71
13
14
16
16
1.42
1.42
0.81
0.81
1.9
2.1
2.4
2.4
R166.0G-27TR01
8.00
4.57
19
0.54
3.3
1.50
2.00
3.00
0.90
1.25
1.75
6
8
12
1.40
1.40
1.29
1.0
1.1
1.6
R/L166.0L-22TR01
4.00
5.00
6.00
7.00
2.24
2.73
3.49
3.71
13
14
16
16
1.45
1.45
0.83
1.03
1.9
2.1
2.4
2.4
R166.0L-27TR01
8.00
4.57
19
0.54
3.3
R/L166.0L-16NF01
MJ 60°
External
R/L166.0G-16MJ01
1.50
2.00
UNJ 60°
32
28
24
20
18
16
14
12
10
8
Round 30°
R166.0G-16RX01
R/L166.0G-16RN01
R166.0G-16RX01
10
8
8
6
6
1.31
1.63
1.65
2.17
2.19
8
10
10
12
12
1.32
1.32
1.30
1.43
1.20
0.85
1.05
1.05
1.5
1.65
R/L166.0G-22RN01
R166.0G-22RX01
4
4
3.25
3.25
14
14
1.38
1.43
2.6
2.6
R166.0L-16RX01
R/L166.0L-16RN01
R166.0L-16RX01
10
8
8
6
6
1.31
1.63
1.65
2.17
2.19
8
10
10
12
12
1.30
1.30
1.32
1.45
1.32
0.85
1.05
1.05
1.35
1.70
R/L166.0L-22RN01
R166.0L-22RX01
4
4
3.25
3.25
14
14
1.35
1.37
2.6
2.6
Internal
R/L166.0L-16RN01
F
BSPT 55°
G
External
R/L166.0G-16PT01
28
19
14
11
8
0.64
0.91
1.22
1.52
2.07
5
6
8
9
12
1.32
1.32
1.32
1.32
1.32
0.8
0.8
1.2
1.4
1.8
28
19
14
11
8
0.64
0.91
1.22
1.52
2.07
5
6
8
9
12
1.30
1.30
1.30
1.30
1.30
0.8
0.8
1.2
1.4
1.8
ISO Trapezoidal 30°
External
R/L166.0G-16TR01
Internal
R/L166.0L-16TR01
Internal
H
R/L166.0L-16PT01
*) Include 0.03 - 0.07 mm stock above the crest.
For each thread profile depth, see ordering part for Hc value
C8
z
0.72
1.08
1.43
1.71
2.45
External
E
x
27
18
14
111/2
8
External
R/L166.0G-16NJ01
R/L166.0G-16RN01
nap
Internal
Internal
C
ap
NPTF 60°
7
6
5
41/2
4
NPT 60°
B
Total infeed
Pitch
mm
t.p.i.
z
cont. Whitworth Internal
R/L166.0L-22WH01
Dimensions x and z
ap = total depth of thread
Turning
Dimensions x and z
ap = total depth of thread
nap = number of passes
Dimensions x and z
ap = total depth of thread
nap = number of passes
Total infeed
Total infeed
Pitch
mm t.p.i.
ap
nap
x
z
ACME 29°
External
R/L166.0G-16AC01
R/L166.0G-22AC01
R166.0G-27AC01
Internal
R/L166.0L-16AC01
R/L166.0L-22AC01
R166.0L-27AC01
16
14
12
10
8
0.96
1.07
1.22
1.57
1.88
6
7
8
10
12
1.33
1.33
1.33
1.33
1.5
1.0
1.1
1.2
1.3
1.5
6
5
4
2.41
2.83
3.46
13
14
16
1.37
1.37
0.76
1.9
2.1
2.4
3
4.52
19
0.54
3.3
16
14
12
10
8
0.95
1.07
1.23
1.59
1.90
6
7
8
10
12
1.30
1.30
1.30
1.30
1.05
0.8
1.0
1.2
1.4
1.5
6
5
4
2.38
2.78
3.44
13
14
16
1.33
0.92
0.81
2.0
2.2
2.4
3
4.51
19
0.54
3.3
5
5
6
7
8
1.33
1.33
1.33
1.33
1.14
0.9
1.0
1.1
1.2
1.5
6
5
4
1.54
1.80
2.18
9
10
12
1.67
1.67
1.67
1.8
2.0
2.4
3
2.85
15
1.76
3.1
16
14
12
10
8
0.68
0.77
0.87
1.14
1.36
5
5
6
7
8
1.33
1.33
1.33
1.33
1.14
0.9
1.0
1.1
1.2
1.5
R/L166.0G-22SA01
6
5
4
1.54
1.80
2.18
9
10
12
1.67
1.67
1.67
1.8
2.0
2.4
R166.0G-27SA01
3
2.85
15
1.76
3.1
Internal
R/L166.0G-16SA01
External
R166.0G-22V381
nap
x
z
A
-0402
-0403
4
4
3.16
3.15
12
12
1.67
1.67
2.6
2.7
-0402
-0403
4
4
3.16
3.15
12
12
1.64
1.64
2.6
2.7
-0402
-0403
4
4
3.82
3.81
15
15
0.98
0.98
2.8
2.9
-0402
-0403
4
4
3.82
3.81
15
15
0.96
0.96
2.8
2.9
5
3.06
12
1.38
2.5
Internal
R166.0L-22V381
B
API 60° V-0.050
External
R166.0G-22V501
Internal
R166.0L-22V501
C
API 60° V-0.040
External
R166.0G-22V401-0503
R166.0L-22V401-0503
0.68
0.77
0.87
1.14
1.36
R166.0G-27SA01
ap
D
Internal
16
14
12
10
8
R/L166.0G-22SA01
t.p.i.
API 60° V-0.038R
STUB-ACME 29°
External
R/L166.0G-16SA01
Pitch
mm
5
3.06
12
1.35
2.5
10
8
1.43
1.82
10
12
1.32
1.32
1.3
1.5
10
8
1.43
1.82
10
12
1.67
1.67
2.0
2.0
R166.0L-16RD01
10
8
1.43
1.82
10
12
1.30
1.30
1.3
1.5
R166.0L-22RD01
10
8
1.43
1.82
10
12
1.64
1.64
2.0
2.0
API Round 60°
External
R166.0G-16RD01
R166.0G-22RD01
E
Internal
F
G
H
*) Include 0.03 - 0.07 mm stock above the crest.
For each thread profile depth, see ordering part for Hc value
C9
Turning
Dimensions x and z
ap = total depth of thread
Dimensions x and z
ap = total depth of thread
nap = number of passes
nap = number of passes
Total infeed
Total infeed
A
Pitch
mm t.p.i.
ap
x
nap
-050
-0501
5
5
1.65
1.65
11
11
1.97
1.97
3.8
3.8
R166.0L-22BU01
-050
-0501
5
5
1.65
1.65
11
11
1.93
1.93
3.6
3.5
External
R166.0G-22VA01
External
16-22 mm
-080
-060
-050
8
6
5
1.06
1.06
1.65
7
7
11
1.67
1.97
1.97
3.3
3.3
3.9
-080
-060
-050
8
6
5
1.11
1.11
1.65
7
7
11
1.64
1.93
1.93
3.2
3.1
3.8
8
6
5
1.06
1.06
1.65
7
7
11
1.67
1.97
1.97
3.3
3.3
3.9
8
6
5
1.11
1.11
1.65
7
7
11
1.64
1.93
1.93
3.2
3.1
3.8
Dimensions x and z
Metric 60° (MM)
UN 60°
Whitworth (WH)
NPT (NT)
Pitch, mm
Pitch, t.p.i.
Pitch, t.p.i.
Pitch, t.p.i.
1.0
1.5
2.0
2.5
3.0
20
18
16
14
12
19
14
11
11.5
x=
1.62
1.42
1.91
1.97
2.76
1.97
2.12
1.53
1.77
1.92
2.02
1.72
1.87
1.67
z=
2.5
2.2
2.9
3.75
4.40
3.10
3.45
2.40
2.70
3.10
3.30
2.70
3.40
3.40
No. of infeeds
Radial infeed per pass, mm
1
0.35
0.36
0.48
0.46
0.55
0.44
0.49
0.39
0.44
0.52
0.48
0.47
0.45
0.50
2
0.32
0.32
0.47
0.44
0.53
0.39
0.44
0.35
0.41
0.48
0.43
0.43
0.43
0.49
3
0.67
0.26
0.33
0.40
0.47
0.83
0.93
0.29
0.32
0.36
0.91
0.33
0.39
0.44
0.94
1.28
0.28
0.34
1.03
1.17
1.36
1.23
0.27
0.31
1.58
1.89
1.54
1.74
4
Internal
Pitch, t.p.i.
Pitch, t.p.i.
1.0
Pitch, mm
1.5
2.0
16
12
19
14
11
11.5
x=
1.59
1.4
1.79
1.50
1.88
1.3
1.62
1.87
1.67
z=
2.4
2.25
2.85
2.30
2.95
2.05
2.70
3.40
3.40
Dimensions
16-22 mm
No. of infeeds
H
z
Internal
Multi-point inserts
Dimensions
G
x
Internal
R166.0L-22VA01
F
-080
-060
-050
R166.0L-22NV01-080
-060
-050
VAM
E
R166.0G-22VA01
R166.0G-22BU01
Internal
D
nap
External
R166.0G-22BU01
C
ap
New VAM
API Buttress
External
B
Pitch
mm t.p.i.
z
Pitch, t.p.i.
Radial infeed per pass, mm
1
0.33
0.34
0.46
0.36
0.48
0.35
0.47
0.45
0.50
2
0.30
0.31
0.42
0.33
0.44
0.31
0.43
0.43
0.49
3
0.63
0.25
0.32
0.26
0.34
0.25
0.33
0.39
0.44
0.90
1.20
0.95
1.26
0.91
1.23
0.27
0.31
1.54
1.74
4
Note! When using grade CB20 max infeed value should be 0.07 mm.
*) Include 0.03 - 0.07 mm stock above the crest.
C 10
For each thread profile depth, see ordering part for Hc value
Turning
TWIN-LOCK
No. of infeeds/
Radial infeed per pass, mm
Thread forms
Total *)
1
infeed
2
3
4
5
6
7
8
9
10
11
12
13
14
15
API Round Vee
R166.39G-24RD03-100
1.48
0.78
0.70
R166.39L-24RD04-100
1.48
0.81
0.67
R166.39G-24RD13-080
1.88
1.08
0.80
R166.39L-24RD04-080
1.88
0.98
0.90
API Buttress
R166.39G-24BU12-050
1.66
0.46
0.44
0.40
0.35
R166.39L-24BU12-050
1.65
0.46
0.44
0.40
0.35
R166.39G-24BU22-050
R166.39L-24BU22-050
1.65
1.65
0.47
0.47
0.44
0.44
0.39
0.39
0.35
0.35
VAM
R166.39G-24VA02-080
R166.39G-24VA02-060
1.06
1.06
0.40
0.40
0.36
0.36
0.30
0.30
A
B
C
*) Include 0.03 - 0.07 mm stock above the crest.
D
E
F
G
H
C 11
Turning
Insert types for treading
Sandvik Coromant offer three different types of threading inserts.
Choice will depend on the technical and economic arguments which apply to particular
operations and the availability of the thread profile required in programmes.
Full profile inserts
A
For high productivity in threading
These inserts are the most commonly
used. They form a complete thread profile including the crest.
– correct depth, bottom and top radii are
ensured and hence a stronger thread.
– blank does not need to be turned to
exact diameter prior to threading and
no deburring needed after threading.
– topping should be 0.03–0.07 mm. Let
the threading tool finish the diameter.
B
– a separate insert is required for each
pitch and profile.
With work hardening materials such as
stainless steel problems can occur if the
depth is too small.
– a full profile insert normally has larger
nose radius than a ”V” profile and therefore fewer passes will be required.
C
V-profile inserts - 60 and 55 degree profiles
For threading with minimum tool inventory
These inserts do not top the crests – fewer inserts need to be stocked.
and therefore the outer diameters for – the nose radius chosen for the insert
is that of the smallest pitch, leading
screws and inner diameter for nuts must
be turned to the right diameter prior to
to shorter tool life because the nose
threading.
radius is not optimized for each thread
profile.
– the same insert can be used for a
range of pitches provided that the
thread angle is the same.
D
E
F
Multi-point inserts
For high productive economic threading in mass production
Similar to the full profile inserts but with – conditions must be extra stable because of longer cutting edge and greater
two or more points.
– fewer passes required giving longer tool
loads.
life, greater productivity and lower tool – only available in the most popular proficosts.
les and pitches.
– the increase in productivity per insert is – N.B. Special infeed recommended must
two times for a two pointed and three
be followed. Relief groove required to
times for a three pointed.
cover all teeth.
– longer passes required beyond workpiece thread to accomodate the extra
points.
G
H
C 12
Turning
Threads:
RH
RH
LH
RH
LH
LH
RH
RH
RH
LH
A
LH
LH
B
RH
LH
C
RH
LH
LH
*
RH
*
LH
RH
D
*
LH
*
E
RH
* Negative helix - select negative shims, see table.
LH
RH
F
Method of threading - right and left-hand threads and inserts
The design of the component and machine tool determines the best method for
threading. Working towards the chuck is
the most common method while working
away from the chuck may also be suitable, but only when producing right-hand
threads with left-hand tools and vice
versa. Compensation must be made for
the negative helix angle through changing the shim.
The advantage of using right-hand tools
for right-hand threads (and similar for
left-hand) is that the holder design is
made to give maximum support to the
insert. However, under normal machining
conditions, the opposite can be applied.
It should also be noted that holder and
insert of the same hand must be used
together for the U-Lock system.
G
The difference in direction between
right and left-hand threads does not affect the thread profile, etc.
H
When selecting method, it is vital to take
into account the direction of cutting forces. These should be directed into the
machine and tool support, especially
when using multi-point inserts.
C 13
Turning
Inclining the insert for
clearance
A
B
C
D
E
F
G
H
In thread turning cutting edge clearance
is essential down the sides of the insert
(flanks). This affects heat and tool wear
development and subsequently the toollife, production security and quality of
the thread produced. In threading, as in
turning, small depths of cut should be
avoided when machining work-hardening
materials. The clearance necessary for
a threading insert is related to the helix angle (λ) of the thread in that these
should be similar. When the inclination
angle (ρ) of the insert is different to the
helix angle, the clearance angles of the
insert will be different. The angle of insert inclination is calculated using the
adjoining formula.
The smaller the thread profile and radial
clearance angles, the smaller the flank
clearance angle.
The angle of inclination is calculated
by using the formula:
λ = arctan
(
P
d2 × π
)
ex. For P = 1.5 and d2 = 25mm
P = Pitch
λ = arctan
d2 = Effective diameter of thread
λ
= arctan
λ
= 1.09°
λ
= Angle of inclination
(
(
1.5
25 × π
)
0.019108
)
Select a 1° shim.
λ=angle of inclination
ρ=helix angle
Co-ordination of helix and inclination angles.
Symmetrical insert flank clearance is
important to achieve satisfactory performance. The tangent value of the angle
that the insert should be inclined at, to
provide the necessary clearance, is related to the pitch divided by the effective diameter of the thread (Dc) times
pi (3.14).
The most common angle of inclination is
one degree which, consequently, is the
standard shim on U-lock toolholders.
This is the central area in the diagram
of pitch and diameter relationship. Additional shims are available for other relationships in one degree steps from -2 to
4 degrees, without changing the cutting
edge height.
For turning left-hand threads with righthand tools and vice versa, negative inclination angles are needed. Smaller
boring bars (16 and 20 mm diameters
with 16 and 22 mm inserts respectively)
for thread turning shims are absent because of limited space, the inclination
then is set to 2 degrees.
Shims for the 166.4 quick change screw
holders are symmetrical, i.e. there are
no left and right hand versions. The shim
used on a right hand holder need only be
reversed to fit a left hand holder. Reinforced 1°, 2°, 3° and 4° shims are available
with this system and are recommended
for use with pitches of 3.0 mm (8 t.p.i.)
C 14
Flank clearance and chip thickness.
Thread profile angle
Internal 15°
External 10°
60
55°
30°
29°
8°30'
7°
4°
4°
6°
5°
2°30'
2°30'
Butress 10/3
2.6°/0.8°
1.8°/0.5°
and larger with 16 mm inserts and 5.5
mm (4.5 t.p.i.) and larger with 22 mm
inserts.
Shims for the 166.5 wedge clamping
system and 166.0 holders for 27 mm
insert size are not symmetrical. They are
available in left and right hand versions,
but are not the same as the shims used
with the older 166.0 eccentric screw
clamping system.
The flank clearance and flank chip thickness decreases significantly on profiles
such as ACME and round threads. The
angle should always be at least 1 degree
and 30 minutes.
When turning work-hardening materials,
every effort should be made to avoid
small D O C to avoid cutting in the workpiece hard skin.
Turning
Selecting shims for inclination
Lead (Pitch) mm
Threads/inch
A
B
C
mm
inch
Workpiece
diameter
D
Pitch
range
Insert
size
Inclination
angle
Shims for QC-screw holders
166.4, 466.4 and 566.4
mm
(t.p.i.)
0.5–3.0
16
(32-8)
3.5–6.0
–1°
22
(7-4)
Pitch
range
mm
(t.p.i.)
8.0
(3)
–2°
Insert
size
27
5322 361-22
Shims for wedge clamping holders
166.5
Reinforced
Right hand
Left hand
–
–
–
–
5322 361-21
–
–
0°
5322 361-101)
–
5322 371-101)
5322 372-101)
1°
5322 361-11
5322 363-11
5322 371-11
5322 372-11
2°
5322 361-12
5322 363-12
5322 371-12
5322 372-12
3°
5322 361-13
5322 363-13
5322 371-13
5322 372-13
4°
5322 361-14
5322 363-14
5322 371-14
5322 372-14
–2°
5322 365-22
–
–1°
5322 365-21
–
0°
5322 365-101)
–
1°
5322 365-11
5322 367-11
2°
5322 365-12
5322 367-12
3°
5322 365-13
5322 367-13
5322 365-14
5322 367-14
4°
Inclination
angle
E
F
G
Shims for U-screw holders 166.0 and 566.0
External
Right hand
Internal
Right hand
0°
5322 385-10
5322 386-10
1°
5322 383-11
5322 383-11
2°
5322 385-12
5322 386-12
3°
5322 385-13
5322 386-13
) Must be used when using U-Lock circlip grooving inserts, type R/L 154.0G.
1
Note!
The last two figures in the shim code indicate + or - and the effective inclination
angle with the shim mounted in the holder.e.g. 5322 361-11 = angle + 1° and
5322 361-21 = angle - 1°.
H
Ordering example: 2 pieces 5322 361-22
Delivered with the tool.
C 15
Turning
When to use the U-Lock system
General usage for all segments of
engineering industry.
General usage for all segments of
engineering industry.
V-profile 60°
ISO MM
UN
A
Whitworth
BSPT Taper 1:16
External
External
Internal
Internal
Pipe threads for steam, gas and
water lines
Pipe fittings and couplings for gas,
water and sewage.
External
External
Internal
Internal
B
NPT Taper 1:16
V-profile 55°
NPTF Taper 1:16
External
External
External
Internal
Internal
Internal
C
D
Pipe couplings in food and
fire fighting industries
Round DIN 405
External
Aerospace threads
MJ, UNJ
Screw threads for motion
transmissions
ISO
Trapezoidal
Oil and gas
External
External
External
E
Internal
Internal
Internal
ACME
STUB-ACME
F
Internal
H
C 16
Internal
External
Internal
API BUT
New VAM, VAM
External
G
API
Taper 1:16
(Rounded)
Taper API
V-0.038R, V-0.040.
V-0.050
External
Internal
Single point inserts
Multi-point inserts
Full form inserts make a complete thread profile
including the crest and ensure correct depth, bottom and crest radii.
V-profile inserts can be used for a range of pitches with the same thread angle.
Inserts with two or more points give fewer passes
and shorter cutting times. Available in the most
common profiles and pitches. A good choice for
economic threading in mass production.
Turning
Toolholder systems for threading
U-Lock insert clamping systems
To cover the complete range of threading tools 3 different
clamping systems are available within the U-Lock family. The
Quick Change (QC) screw system, coded 166.4. with a tilting
screw giving a very strong clamping of the insert, is the main
system covering most applications for insert sizes 16 and
22 mm. For external holders where accessibility against tail stock
is of special importance the wedge clamping system, coded 166.5,
is available for insert size 16 mm. For both external and internal
holders for insert size 27 mm and internal holders for insert size
11 mm a normal T-Max U screw is used for clamping.
For holders using shims the holders are supplied with a shim giving +1° inclination angle. The inclination angle depends on the
combination or workpiece diameter and thread pitch. Please note
that when using these holders for U-Lock grooving inserts, type
154.0, a shim giving an inclination angle of 0° must be used.
The procedure for changing both shims and inserts is described below. The procedure for changing or indexing the insert
only is marked in italic text.
A
B
Quick Change screw clamping system (166.4)
Insert
Sequence of assembly:
1) Place the shim in the insert pocket.
2) Lock the shim in position by screwing in the lock screw from the side.
3) Install Quick Change screw – but do not tighten.
4) Place insert over the top of the QC-screw and fully tighten.
Quick Change
screw
Shim
166.4
Shim
screw
C
To change or index the insert turn the quick change screw 2 to 3 turns.
The screw can be loosened and tightened from either top or bottom.
No shims are used for insert size 16 mm in 16 mm diameter bars and for insert
size 22 mm in 20 mm diameter bars.
D
Wedge clamping system (166.5 FA)
Wedge set
Insert
Centre pin
Shim
166.5
Sequence of assembly:
1) Place the shim in the insert pocket.
2) Push the centre pin through the centre hole of the shim and use the thumb to
turn it until the thread engages in the holder.
3) Lock the shim in position by using the key from below to turn the pin
anti-clockwise.
4) Place the insert in the insert pocket with the centre hole over the pin
5) Place the wedge in position and tighten the screw to lock the insert against
the pin.
E
F
To change or index the insert turn the screw 2 to 3 turns.
The screw can be loosened and tightened from either top or bottom.
G
T-Max U screw clamping system (166.0)
U-screw
(Alternative for 166.4)
Insert
Sequence of assembly:
1) Place the shim in the insert pocket.
2) Lock the shim in position by screwing in the shim screw through the
shim hole or from the side.
3) Place the insert in the insert pocket.
4) Lock the insert in position using the U-screw.
Shim screw
Shim
166.0
H
To change or index the insert remove the screw completely.
No shims are used for insert size 11 mm.
C 17
Turning
Cutting speed for threading
ISO
CMC
No.
Material
Hardness
Brinell
HB
Grades
GC1020
GC4125
H13A
Cutting speed vc m/min
A
P
B
C
M
D
E
K
F
N
G
H
S
01.0
01.1
01.2
01.3
01.4
01.5
Unalloyed steel
C = 0.5 - 0.1%
C = 0.1 - 0.25%
C = 0.25 - 0.55%
C = 0.55 - 0.80%
High carbon steel, annealed
Hardened and tempered
125
125
150
170
210
300
180
185
155
155
130
110
200
205
170
170
145
120
155
160
130
135
110
95
02.1
02.2
02.2
Low-alloy steel
(alloying elements ≤5%)
Non-hardened
Hardened and tempered
Hardened and tempered
175
330
350
125
80
75
140
90
85
115
70
65
03.11
03.13
03.21
03.22
High-alloy steel
(alloying elements >5%)
Annealed
Annealed HSS
Hardened tool steel
Hardened steel, others
200
200
300
380
110
110
90
65
120
120
95
75
95
95
75
55
06.1
06.2
06.3
06.33
06.34
Steel castings
Unalloyed
Low-alloy (alloying elements ≤5%)
High-alloy, (alloying elements >5%)
Manganese steel, 12–14% Mn
Hardened and tempered
150
200
200
250
380
250
110
125
35
–
275
120
140
40
–
210
95
100
35
50
05.10
05.11
05.12
05.13
Stainless steel
– Bars/forged
Ferritic/martensitic
Free machining steel
Non-hardened
PH-hardened
Hardened
200
200
330
330
170
130
85
90
185
145
95
100
115
90
70
65
05.20
05.21
05.22
05.23
Stainless steel
– Bars/forged
Austenitic
Free machining steel
Austenitic
PH-hardened
Super austenitic
200
200
330
200
140
120
70
80
155
130
75
85
95
70
60
50
05.51
05.52
Stainless steel –
Bars/forged
Austenitic-ferritic (Duplex)
Non-weldable C ≥ 0.05%
Weldable C < 0.05%
230
260
95
75
105
80
–
–
15.11
15.13
Stainless steel - Cast
Ferritic/martensitic
Non-hardened
Hardened
200
330
90
65
100
75
90
50
15.21
15.22
Stainless steel - Cast
Austenitic
Austenitic
PH-hardened
200
330
85
60
95
65
70
50
15.51
15.52
Stainless steel - Cast
Austenitic-ferritic (Duplex)
Non-weldable ≥ 0.05%C
Weldable <0.05%C
230
260
85
65
95
70
–
–
07.1
07.2
07.3
Malleable cast iron
Ferritic (short chipping)
Pearlitic (long chipping)
Martensitic
130
230
250
135
100
90
145
110
100
95
70
65
08.1
08.2
08.3
Grey cast iron
Low tensile strength
High tensile strength
Austenitic
180
245
175
130
110
130
140
120
140
85
80
125
09.1
09.2
09.3
Nodular SG iron
Ferritic
Pearlitic
Martensitic
160
250
330
125
90
75
135
100
85
110
50
30
30.11
30.12
Aluminium alloys
Wrought/wrought and
+ cold-worked, non aging
Aged
60
100
1390
490
1530
535
495
450
30.21
30.22
Aluminium alloys
Cast, non-aging
Cast or cast and aged
75
90
455
280
500
305
425
250
30.3
Aluminium alloys
Unalloyed (Al > 99%)
30
140
155
1000
30.41
30.42
Aluminium alloys
Cast Si 13-15%
Cast Si 16-22%
130
130
245
245
270
270
210
210
33.1
33.2
33.3
Copper and copper alloys
Free cutting alloys, ≥1% Pb
Brass, leaded bronzes, ≤1% Pb
Bronze and non-leadad copper incl. electrolytic
copper
110
90
100
420
245
175
460
270
190
370
210
150
20.11
20.12
Heat resistant
alloys
Annealed
Aged
200
280
45
30
50
35
45
30
250
350
275
320
20
15
10
10
20
15
15
10
20
15
10
10
200
300
320
25
15
15
25
15
15
20
15
15
140
60
50
155
65
55
120
50
40
20.21
20.22
20.23
20.24
Annealed
Aged
Cold drawn
Cast
20.31
20.32
20.33
Annealed
Aged
Cast
23.1
23.21
23.22
C 18
Titanium alloys
Commercial pure (99.5% Ti)
α, near α and α + β alloys, annealed
α + β alloys (aged), β alloys (annealed or aged)
Iron base
Nickel base
Cobalt base
400 Rm
950 Rm
1050 Rm
Turning
ISO
CMC
No.
Material
Hardness
Brinell
HB
Grades
GC1020
GC4125
H13A
CB20
Cutting speed vc m/min
H
04.1
Extra hard steel
Hardened and temperedl
10.1
Chilled cast iron
Cast or cast and aged
Note
• The above values are nominal
and, in practice, can often be
increased by up to 30%. When
attempting to establish optimal
cutting speed the cutting edge
should be monitored carefully.
• When threading stainless steel
it is important that the cutting
speed is sufficiently high to avoid
the formation of “built-up edge”.
59 HRC
400
45
45
45
125
15
15
–
–
• Cutting data should be
reduced for fine pitches and
small nose radii.
• For threads requiring
inserts with small nose radii, eg.
NPT, the thread can first be rough
machined using an insert with a
large nose radius in order to get
a longer tool life from the small
nose radius insert.
B
➠
Grades for T-MAX U-Lock threading
01
Wear resistance
P
10
GC
1020
GC
4125
Toughness
30
40
➠
➠
GC
4125
H13A
GC
1020
H13A
➠
➠
40
10
20
GC
1020
GC
4125
H13A
30
Hard materials
20
30
40
CB20–Cubic boron nitride
The hardest material known after diamond. It is recommended primarily for finishing
operations in hardened materials.
When using grade CB20 max infeed value should be 0.07 mm.
CB20
GC
1020
GC
4125
G
H
➠
10
F
➠
40
H
Complementary grades
H13A, an uncoated grade with extreme edge sharpness in the ISO K20 area, suitable
for threading in cast iron, chilled cast iron and aerospace materials.
➠
Toughness
Wear resistance
Non-ferreous
metals
30
Toughness
Wear resistance
GC
1020
E
➠
20
Super alloys and
titanium
H13A
30
10
D
GC4125 is a PVD TiAlN coated grade in the ISO P15, M15 and K15 areas. The grade
has high wear resistance at high cutting speeds and long cutting times. Most suitable
for threading in steel, but also work good in stainless steel and cast iron.
➠
20
N
S
GC
1020
40
10
Optimizing grade
Toughness
Wear resistance
01
30
C
➠
K
Cast iron
20
GC
4125
Toughness
Wear resistance
10
Stainless steel
M
GC1020. a PVD TiN coated grade in the ISO P20 and M20 areas and ISO K15. It
combines the superior wear resistance of a coated grade with the edge sharpness
and toughness of an uncoated one. An excellent all-round grade, particularly recommended for use in stainless and low carbon steels.
➠
50
Basic grade
Toughness
Wear resistance
Steel
20
A
Additional coverage due to the F-geometry
C 19
Turning
Selecting the insert geometry and grade
A
Standard geometry
Complementary geometries
–
Rounded (ER treated) cutting edge
Geometry F
Sharp cutting edge
Geometry C
Chip breaking geometry
Indicated by a
dash (-) in the
identicode.
Indicated by
a “F” in the
identicode.
Indicated by
a “C” in the
identicode.
ex. R166.OG-16MM-100
ex. 166.OG-16MMF100
ex. 166.OG-16MM C100
- first choice in most operations
and materials
- good chip forming
- good edge security
- few passes required
– clean cuts in sticky or work hardening
materials
– reduced cutting forces and good surface finishes
– less built-up edge
- for maximum chip control and
minimum supervision
- an optimizer for low carbon and low
alloy steels
To be used with modified flank infeed
only.
B
C
D
E
Basic grade GC1020
has been specially developed for threading operations in most materials
and particularly recommended for use
in stainless and low carbon steels.
Combined with the sharp F-geometry it
is a good choice for Duplex steels, heat
resistant and titanium alloys.
Optimizing grade: GC4125
A grade developed for higher cutting
speeds and long cutting time.
Complementary grades:
H13A is an uncoated grade with extreme
edge sharpness, suitable for chilled cast
iron, cast iron and aerospace materials.
CB20, cubic boron nitride, primarily for
finishing operations in hardened materials.
How to combine grade and geometry
F
ISO/
ANSI
Material
P
Steel
Geometries
All-round
Grades
F
C
GC1020
GC4125
H13A
CB20
C < 0.1%.
Carbon
Low alloy
High alloy
Cast steel
G
M
Stainless steel
Stainless steel (mart./fer.)
Annealed austenitic
Cold-worked austenitic
Cast
H
K
Cast iron
N
Al and non-ferrous
S
Heat resistant alloys
H
Hard materials
Grey
Nodular
Titanium alloys
1st choice
C 20
2nd choice
Alternative
Turning
T-MAX U-Lock inserts for threading
R/L166.0G
R/L166.0L
A
Application types
External
Internal
B
Insert sizes, mm
11
27
22
16
C
Profile options
1
3
2
D
4
5
E
Crest form
Taper angles
F
Full profile = A-type
V-profile = N-type
G
Options
R = right hand / L = left hand
Profile options
Pitch
Taper angles
1–5, see above
Expressed in – mm or t.p.i
T1. T2. see above
Insert size
External – 16, 22, 27 mm
Internal – 11, 16, 22, 27 mm
Crest forms
Dimensions
Full profile – A-type, V-profile – N-type
Angles, radius, thread depths
Insert
grades
H13A, H10F, GC1015, GC1020, GC1025
Application
types
External / Internal
R/L
H
C 21
Turning
Toolholders for threading and circlip grooving
External
166.4FG
166.4FG
166.0FG
Threading of slender components
and against live
centre
Drop head design for upside down
mounting
166.5FA
166.4FGZ
166.4FGZ
A
Insert size
B
Coromant Capto
Capto sizes
16, 22 mm
16, 22, 27 mm
C3–C8
Shank tools
Shank dimensions
C3–C6
1616–4040 mm
16, 22 mm
16 mm
C3–C6
1212–2525 mm
2525–3232 mm
C
Circlip grooving
Min. hole diameter 12 mm.
Internal
Steel bars
D
E
166.0KF
166.4KF
Insert size
Coromant Capto
Capto sizes
11, 16, 22 mm
F
Carbide reinforced
bars
166.0KF
166.4KF
11, 16, 22, 27 mm
16–50 mm
To be used in standard
boring bars 570-3 and
570-2.
Overhangs up to
7 × bar dia.
H
Insert size
Cutting heads/bars
Bar diameter
11, 16 mm
10–16 mm
Boring bars
566.4KFC
566.0KFC
11, 16, 22 mm
16–20 mm
Cartridges
Min. hole diameter
55 mm.
570-3
570-2
Sleeves
466.39KF TwinLock
466.4KF
131-
For bar diameter
10, 12, 16 and
20 mm.
11, 16, 22, 27 mm
16–60 mm
Insert size
16, 22 mm
Cartridges
Shank size code
16 CA, 20 CA
C 22
11, 16, 22 mm
166.4KFZ
166.0KFZ
C3–C6
Exchangeable cutting heads
Min. hole diameter: 20 mm
G
166.0KF
166.4KF
154.0KF
154.4KF
166.0KF
166.4KF
C3–C6
Threading bars
Bar diameters
Drop head design
for upside down
mounting
132L/132W
For bar diameter
10, 12, 16 and
20 mm.
Turning
Threading close to the centre
When threading small diameter workpieces accessibility close
to the centre can be difficult, especially in Multi-Task machines
where space is scarce. To overcome this the Coromant Capto
assortment has cutting units in wedge clamp design for T-Max
U-Lock threading insert, designated 166.5FA that are specially
designed to enable machining close to the centre.
A
The cutting units are available from size C3 up to C6 in both
right and left hand design, right hand cutting units are also available for up side down mounting. All T-Max U-Lock threading
inserts in size 16 mm (iC = 3/8") can be used.
B
Modification of round shank tools for small
holes.
C
Internal boring bars and their modular equivalents, can easily
be modified for threading in small holes where normally a special bar would be required. The bars do not lose much rigidity after modification if recommended minimum dimensions
(Dm mod) in the tables are used.
D
Thread turning application hints
Threading with modern cutting tools is an efficient and reliable machining process
which produces high-quality threads when performed correctly. There are a few vital
factors to consider to achieve success :
●
check the workpiece diameter for correct working allowance before thread-turning
(add 0.14 mm as crest allowance)
●
position the tool accurately in the machine
●
check the setting of the cutting edge in relation to pitch diameter
●
make sure the right insert geometry is used (All-round, F or C)
●
ensure there is sufficent and even clearance (insert-inclination shims)
●
if threads are rejected, check whole set-up, including machine tool
●
check the available CNC programme for thread turning
●
optimize infeed method, number and sizes of passes
●
ensure it is the correct cutting speed for the demands of the application
●
in case of pitch error on component thread, check to see if machine pitch is correct
E
F
G
H
C 23
Turning
If problems should occur
Problem:
Cause:
Remedy:
Plastic deformation
– Excessive temperature in cutting zone
– Reduce the cutting speed.
– Increase number of infeeds.
– Reduce the largest infeed depth
– Check the diameter before threading.
– Inadequate supply of coolant
– Improve coolant supply.
– Wrong grade
– Choose a grade with better resistance to
plastic deformation.
– Cutting edge temperature too low.
– Often occurs in stainless material.
– Often occurs in low carbon steel
– Unsuitable grade
– Increase cutting speed.
– Choose an insert with good toughness,
preferably PVD coated.
– Wrong turned diameter prior to
threading operation.
– Turn to correct diameter before threading
(0.03 – 0.07 mm) radially larger than max.
thread diameter.
– Infeed series too tough.
– Increase number of infeeds.
– Reduce size of the largest infeeds.
– Wrong grade.
– Choose a tougher grade.
– Poor chip control.
– Change to C-geometry and use modified flank infeed.
– Centre height incorrect.
– Correct centre height.
– Highly abrasive material.
– Wrong grade. Choose a more wear resistant grade.
– Cutting speed too high.
– Reduce cutting speed.
– Infeed depths too shallow.
– Reduce number of infeeds.
– Insert is above centre line.
– Correct centre height.
A
A
B
Starts as plastic deformation (A)
which leads to plastic break (B).
B
C
Built-up edge (BUE) /
Edge spalling
A
D
B
BUE (A) and edge spalling (B) often
occur in combination. Accumulated
BUE is then ripped away together
with small amounts of insert
material which gives spalling.
E
Insert breakage
F
G
H
Excessive flank wear
C 24
Turning
Problem:
Abnormal flank wear/
Poor surface in one flank of
thread
Cause:
– Incorrect method for flank infeed
Remedy:
– Change method of flank infeed
for F-geometry and All-round geometry:
3 – 5° from flank, for C-geometry: 1° from flank.
A
– Insert inclination angle does not agree with
the lead angle of the thread.
– Change shim to obtain correct angle of inclination.
– Incorrect clamping of the work piece
– Incorrect set-up of the tool.
– Use softer jaws.
– Optimize centre hole and check pressure of face
driver.
– Minimize overhang of tool.
– Check that the clamping sleeve for bars is not worn.
– Use 570-3 anti-vibration bars.
– Incorrect cutting data.
– Increase cutting speed; if this does not help lower
speed dramatically.
– Use constant infeed series 0.1 - 0.16.
– Try F-geometry.
– Incorrect centre height.
– Adjust centre height.
Poor thread surface quality
in general
– Cutting speed too low.
– The insert is above the centre height.
– Uncontrolled chips.
– Increase cutting speed.
– Adjust centre height.
– Use C-geometry and modified flank infeed.
Poor chip control
– Incorrect method of infeed.
– Wrong geometry.
– Modified flank infeed 3 – 5°.
– Use C-geometry with modified flank infeed 1°.
Shallow profile
– Wrong centre height.
– Insert breakage.
– Excessive wear.
– Adjust centre height.
– Change cutting edge.
Incorrect thread profile
– Unsuitable thread profile, angle of thread and
nose radius; external inserts used for internal
operation or vice versa.
– Wrong centre height.
– Holder not 90° to centre line.
– Pitch error in machine.
– Correct tool and insert combination.
– Work hardening material in combination with
infeed depths which are too shallow.
– Reduce the number of infeeds.
– Change to F-geometry.
– Excessive pressure on cutting edge.
– Change to a tougher grade.
– Profile with too small infeed angle.
– Use modified flank infeed.
Vibration
B
C
D
E
Excessive edge pressure
F
G
– Adjust centre height.
– Adjust to 90°.
– Correct the machine.
H
C 25
Turning
Infeed values recommendations
ISO metric, external
No. of
infeeds
Pitch
mm
Reduce cutting speed
0.5
0.75
1.0
1.25
1.5
1.75
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Radial infeed per pass, mm
A
B
1
0.11
0.17
0.19
0.20
0.22
0.22
0.25
0.27
0.28
0.34
0.34
0.37
0.41
0.43
0.46
2
0.09
0.15
0.16
0.17
0.21
0.21
0.24
0.24
0.26
0.31
0.32
0.34
0.39
0.40
0.43
3
0.07
0.11
0.13
0.14
0.17
0.17
0.18
0.20
0.21
0.25
0.25
0.28
0.32
0.32
0.35
4
0.07
0.07
0.11
0.11
0.14
0.14
0.16
0.17
0.18
0.21
0.22
0.24
0.27
0.27
0.30
5
0.34
0.50
6
0.08
0.10
0.12
0.12
0.14
0.15
0.16
0.18
0.19
0.22
0.24
0.24
0.27
0.67
0.08
0.08
0.10
0.12
0.13
0.14
0.17
0.17
0.20
0.22
0.22
0.24
0.80
0.94
7
C
0.10
0.11
0.12
0.13
0.15
0.16
0.18
0.20
0.20
0.22
8
0.08
0.08
0.11
0.12
0.14
0.15
0.17
0.19
0.19
0.21
9
1.14
1.28
0.11
0.12
0.14
0.14
0.16
0.18
0.18
0.20
10
0.08
0.11
0.12
0.13
0.15
0.17
0.17
0.19
11
1.58
0.10
0.11
0.12
0.14
0.16
0.16
0.18
12
0.08
0.08
0.12
0.13
0.15
0.15
0.16
13
1.89
2.20
0.11
0.12
0.12
0.13
0.15
14
0.08
0.10
0.10
0.13
0.14
15
2.50
2.80
3.12
0.12
0.12
0.10
0.10
16
D
Note! When using grade CB20 max infeed value should be 0.07 mm. When closer thread tolerances are needed a last pass without infeed (spring pass)
may be used. For hand materials the number of passes should be incrased. When threading work-hardening materials e.g. stainless austenitic-steel, the
infeed should not be less than 0.08 mm.
E
ISO metric, internal
No. of
Pitch
infeeds
mm
Reduce cutting speed
0.5
0.75
1.0
1.25
1.5
1.75
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Radial infeed per pass, mm
F
1
0.11
0.17
0.19
0.20
0.22
0.22
0.25
0.27
0.28
0.32
0.33
0.36
0.41
0.41
0.44
2
0.09
0.14
0.16
0.17
0.21
0.21
0.23
0.25
0.26
0.30
0.31
0.33
0.38
0.38
0.41
3
0.07
0.10
0.11
0.13
0.15
0.15
0.17
0.18
0.20
0.23
0.24
0.27
0.30
0.32
0.35
4
0.07
0.07
0.09
0.10
0.13
0.13
0.14
0.15
0.16
0.19
0.21
0.23
0.25
0.26
0.28
5
0.34
0.48
6
7
G
H
0.08
0.09
0.11
0.10
0.12
0.13
0.14
0.17
0.18
0.21
0.22
0.22
0.24
0.63
0.08
0.08
0.09
0.11
0.12
0.13
0.15
0.15
0.19
0.20
0.20
0.22
0.77
0.90
0.09
0.10
0.11
0.12
0.14
0.14
0.16
0.17
0.18
0.20
8
0.08
0.08
0.10
0.11
0.13
0.13
0.15
0.16
0.17
0.19
9
1.07
1.20
0.10
0.10
0.12
0.12
0.14
0.15
0.16
0.18
10
0.08
0.10
0.11
0.12
0.13
0.15
0.15
0.16
11
1.49
0.09
0.10
0.11
0.12
0.14
0.14
0.15
12
0.08
0.08
0.10
0.12
0.14
0.14
0.15
13
1.77
2.04
0.10
0.11
0.12
0.13
0.14
14
0.08
0.10
0.10
0.12
0.13
15
2.32
2.62
2.89
0.12
0.12
0.10
0.10
3.20
3.46
16
Note! When using grade CB20 max infeed value should be 0.07 mm.
C 26
Turning
ISO inch, external
No. of
Pitch Threads/inch
infeeds
32
1
0.17 0.17 0.19 0.20 0.23 0.22 0.23 0.25 0.27 0.27 0.27 0.28 0.30 0.35 0.36 0.43 0.45 0.47
2
0.15 0.15 0.17 0.19 0.21 0.21 0.22 0.24 0.26 0.25 0.26 0.26 0.28 0.33 0.34 0.40 0.41 0.44
3
0.12 0.12 0.15 0.14 0.16 0.16 0.17 0.18 0.20 0.20 0.20 0.21 0.22 0.26 0.27 0.32 0.35 0.36
4
0.08 0.10 0.12 0.12 0.13 0.13 0.14 0.15 0.16 0.17 0.17 0.18 0.19 0.22 0.23 0.28 0.28 0.33
5
0.52 0.08 0.08 0.10 0.12 0.12 0.12 0.13 0.14 0.15 0.15 0.16 0.17 0.19 0.20 0.24 0.24 0.26
6
0.62 0.71 0.08 0.08 0.11 0.11 0.12 0.13 0.13 0.14 0.14 0.15 0.17 0.18 0.22 0.22 0.26
7
0.83 0.93 0.08 0.10 0.11 0.12 0.12 0.13 0.13 0.14 0.16 0.17 0.20 0.21 0.24
8
1.03 0.08 0.08 0.08 0.11 0.12 0.12 0.13 0.15 0.16 0.19 0.20 0.23
9
1.17 1.26 1.36 0.08 0.11 0.12 0.12 0.14 0.15 0.19 0.18 0.22
28
24
20
Reduce cutting speed
18
16
14
13
12
11
10
9
8
7
6
5
4.5
4
Radial infeed per pass, mm
10
1.48 0.08 0.11 0.12 0.12 0.14 0.18 0.17 0.21
11
1.63 0.08 0.11 0.11 0.13 0.17 0.16 0.19
12
1.79 0.08 0.08 0.12 0.15 0.15 0.18
13
2.01 2.28 0.11 0.12 0.14 0.16
14
0.10 0.10 0.14 0.15
15
2.66 3.19 0.12 0.12
16
0.10 0.10
A
B
C
D
3.52 3.96
Note! When using grade CB20 max infeed value should be 0.07 mm.
E
ISO inch, internal
No. of
Pitch Threads/inch
infeeds
32
28
24
20
Reduce cutting speed
18
16
14
13
12
11
10
9
8
7
6
5
4.5
4
Radial infeed per pass, mm
1
0.17 0.17 0.18 0.20 0.23 0.22 0.23 0.25 0.27 0.27 0.27 0.28 0.30 0.34 0.35 0.42 0.41 0.44
2
0.14 0.14 0.16 0.17 0.19 0.20 0.21 0.22 0.24 0.24 0.25 0.26 0.28 0.32 0.33 0.38 0.38 0.41
3
0.10 0.10 0.14 0.13 0.14 0.14 0.15 0.16 0.18 0.18 0.18 0.19 0.21 0.23 0.24 0.30 0.32 0.36
4
0.08 0.10 0.10 0.11 0.12 0.12 0.13 0.13 0.15 0.15 0.15 0.16 0.17 0.20 0.20 0.25 0.26 0.30
5
0.49 0.08 0.08 0.09 0.10 0.10 0.11 0.12 0.13 0.13 0.13 0.14 0.15 0.17 0.18 0.22 0.22 0.26
6
0.59 0.66 0.08 0.08 0.09 0.10 0.11 0.11 0.12 0.12 0.13 0.13 0.15 0.16 0.20 0.20 0.23
7
0.78 0.86 0.08 0.09 0.10 0.10 0.11 0.11 0.12 0.12 0.14 0.15 0.18 0.19 0.22
8
0.95 0.08 0.08 0.08 0.10 0.10 0.11 0.11 0.13 0.14 0.17 0.18 0.21
9
1.10 1.17 0.26 0.08 0.10 0.10 0.11 0.12 0.13 0.16 0.17 0.20
10
1.38 0.08 0.09 0.10 0.12 0.12 0.15 0.16 0.18
11
1.49 0.08 0.10 0.11 0.12 0.14 0.15 0.17
12
1.66 0.08 0.08 0.11 0.14 0.14 0.16
13
1.86 2.11 0.11 0.12 0.14 0.15
14
0.10 0.10 0.13 0.14
15
2.44 2.93 0.12 0.12
16
0.10 0.10
F
G
H
3.27 3.65
Note! When using grade CB20 max infeed value should be 0.07 mm.
C 27
Turning
Whitworth, external and internal
No. of
infeeds
Pitch Threads/inch
28
26
20
Reduce cutting speed
19
18
16
14
12
11
10
9
8
7
6
5
4.5
4
Radial infeed per pass, mm
A
B
C
1
0.18 0.19 0.21 0.22 0.23 0.22 0.24 0.28 0.27 0.27 0.28 0.30 0.35 0.36 0.43 0.44 0.47
2
0.15 0.16 0.19 0.20 0.21 0.20 0.22 0.26 0.25 0.26 0.27 0.28 0.33 0.34 0.41 0.41 0.44
3
0.12 0.14 0.15 0.16 0.17 0.16 0.18 0.21 0.21 0.21 0.22 0.23 0.27 0.28 0.36 0.36 0.36
4
0.11 0.11 0.13 0.13 0.14 0.14 0.15 0.17 0.18 0.18 0.19 0.20 0.23 0.24 0.30 0.31 0.34
5
0.08 0.08 0.11 0.12 0.13 0.12 0.13 0.15 0.16 0.16 0.17 0.18 0.21 0.21 0.27 0.27 0.32
6
0.64 0.68 0.08 0.08 0.11 0.10 0.12 0.14 0.14 0.15 0.15 0.16 0.19 0.20 0.24 0.24 0.29
7
0.87 0.91 0.08 0.10 0.11 0.13 0.13 0.13 0.14 0.15 0.18 0.19 0.22 0.23 0.28
8
1.07 0.08 0.08 0.08 0.12 0.13 0.13 0.14 0.16 0.17 0.20 0.22 0.26
9
1.12 1.23 1.42 0.08 0.12 0.12 0.13 0.15 0.16 0.19 0.20 0.24
10
1.54 0.08 0.12 0.12 0.14 0.15 0.18 0.18 0.22
11
1.69 0.08 0.12 0.12 0.14 0.17 0.17 0.20
12
1.87 0.08 0.08 0.14 0.15 0.16 0.19
13
2.09 2.41 0.12 0.12 0.15 0.17
14
0.10 0.10 0.14 0.15
15
2.80 3.34 0.12 0.12
16
0.10 0.10
3.70 4.15
Note! When using grade CB20 max infeed value should be 0.07 mm.
D
Round Din 405, external and internal
BSPT, external and internal
E
No. of
infeeds
No. of
Pitch Threads/inch
28
19
14
11
8
infeeds
G
H
Reduce cutting speed
28
19
14
11
Radial infeed per pass, mm
Radial infeed per pass, mm
F
Pitch Threads/inch
1
0.18 0.22 0.24 0.26 0.29
1
0.23 0.23 0.28 0.36
2
0.15 0.20 0.21 0.24 0.27
2
0.22 0.22 0.26 0.34
3
0.12 0.16 0.18 0.21 0.23
3
0.21 0.21 0.24 0.32
4
0.11 0.13 0.15 0.18 0.20
4
0.19 0.19 0.22 0.30
5
0.08 0.12 0.13 0.16 0.18
5
0.16 0.18 0.21 0.28
6
0.64 0.08 0.12 0.14 0.16
6
0.12 0.16 0.19 0.26
7
0.91 0.11 0.13 0.15
7
0.10 0.14 0.17 0.24
8
0.08 0.12 0.14
8
0.08 0.12 0.16 0.22
9
1.22 0.08 0.13
9
1.31 0.10 0.14 0.20
10
1.52 0.12
10
0.08 0.12 0.19
11
0.12
11
1.63 0.10 0.17
12
0.08
12
0.08 0.15
2.07
13
2.17 0.12
14
0.10
3.25
Note! When using grade CB20 max infeed value should be 0.07 mm.
C 28
Turning
NPT threading inserts
NPT, external and internal
No. of
Pitch Threads/inch
infeeds
27
18
14
111/2
8
Radial infeed per pass, mm
1
0.20 0.22 0.24 0.25 0.26
2
0.15 0.18 0.20 0.20 0.23
3
0.13 0.15 0.17 0.18 0.21
4
0.11 0.14 0.15 0.16 0.19
5
0.09 0.13 0.14 0.16 0.18
6
0.08 0.12 0.13 0.14 0.18
7
0.76 0.10 0.12 0.14 0.17
8
0.08 0.10 0.12 0.17
9
1.12 0.10 0.12 0.16
10
0.08 0.10 0.16
11
1.43 0.09 0.14
12
0.08 0.13
13
1.74 0.12
14
0.11
15
0.08
Because of the small nose radius the cutting
speed should be reduced by 30 to 50%. When
machining coarse threads it is advantageous to
pre-machine the thread with a conventional
triangular insert, e.g MTENN.
A
B
C
2.49
Note! When using grade CB20 max infeed value should be 0.07 mm.
D
E
Acme, external
Acme, internal
No. of
Pitch Threads/inch
No. of
Pitch Threads/inch
infeeds
Reduce cutting speed
infeeds
Reduce cutting speed
16
14
12
10
8
6
5
4
16
14
12
10
8
6
5
4
Radial infeed per pass, mm
Radial infeed per pass, mm
1
0.23 0.22 0.25 0.27 0.29 0.32 0.34 0.37
1
0.23 0.22 0.25 0.27 0.29 0.32 0.34 0.37
2
0.21 0.20 0.22 0.23 0.25 0.28 0.32 0.34
2
0.21 0.20 0.22 0.23 0.25 0.27 0.31 0.33
3
0.18 0.18 0.17 0.20 0.21 0.23 0.25 0.30
3
0.17 0.18 0.17 0.20 0.21 0.23 0.25 0.30
4
0.14 0.15 0.14 0.18 0.17 0.21 0.23 0.27
4
0.14 0.15 0.15 0.18 0.17 0.20 0.23 0.27
5
0.12 0.13 0.13 0.14 0.15 0.18 0.22 0.25
5
0.12 0.13 0.13 0.15 0.15 0.18 0.22 0.25
6
0.08 0.11 0.12 0.12 0.13 0.18 0.20 0.24
6
0.08 0.11 0.12 0.12 0.14 0.18 0.20 0.23
7
0.96 0.08 0.10 0.12 0.13 0.16 0.19 0.21
7
0.95 0.08 0.10 0.12 0.13 0.16 0.19 0.21
8
1.07 0.09 0.11 0.12 0.16 0.19 0.20
8
1.07 0.09 0.11 0.12 0.15 0.19 0.20
9
1.22 0.11 0.12 0.16 0.18 0.20
9
1.23 0.11 0.12 0.15 0.17 0.20
10
0.09 0.11 0.15 0.16 0.18
10
0.09 0.12 0.15 0.16 0.18
11
1.57 0.11 0.14 0.15 0.17
11
1.59 0.11 0.14 0.15 0.17
12
0.09 0.13 0.14 0.16
12
0.09 0.13 0.14 0.16
13
1.88 0.11 0.13 0.16
13
1.90 0.11 0.13 0.16
14
2.41 0.11 0.15
14
2.38 0.11 0.15
15
2.83 0.14
15
2.78 0.14
16
0.12
16
0.12
3.46
F
G
H
3.44
C 29
Turning
Stub-Acme, external
Stub-Acme, internal
No. of
Pitch Threads/inch
No. of
infeeds
Reduce cutting speed
infeeds
16
14
12
10
8
6
5
B
Reduce cutting speed
16
4
Radial infeed per pass, mm
A
Pitch Threads/inch
14
12
10
8
6
5
1
0.21 0.24 0.24 0.26 0.28 0.30 0.32 0.35
1
Radial infeed per pass, mm
0.19 0.22 0.22 0.24 0.26 0.29 0.32 0.35
2
0.14 0.17 0.17 0.19 0.21 0.23 0.25 0.28
2
0.12 0.15 0.15 0.17 0.19 0.23 0.25 0.28
3
0.13 0.15 0.15 0.18 0.19 0.19 0.21 0.24
3
0.12 0.13 0.13 0.16 0.17 0.19 0.21 0.24
4
0.11 0.12 0.12 0.16 0.17 0.17 0.19 0.21
4
0.11 0.12 0.11 0.15 0.16 0.17 0.19 0.21
5
0.09 0.09 0.10 0.14 0.16 0.16 0.18 0.20
5
0.09 0.09 0.10 0.14 0.15 0.16 0.18 0.20
6
0.68 0.77 0.09 0.12 0.14 0.14 0.16 0.18
6
0.63 0.71 0.09 0.12 0.14 0.14 0.16 0.18
7
0.87 0.09 0.12 0.14 0.14 0.14
7
0.80 0.09 0.12 0.14 0.14 0.14
8
1.14 0.09 0.12 0.14 0.14
8
1.07 0.09 0.12 0.14 0.14
9
1.36 0.09 0.12 0.13
9
1.28 0.09 0.12 0.13
10
1.54 0.09 0.12
10
1.55 0.09 0.12
11
1.80 0.10
11
1.80 0.10
0.09
12
0.09
12
C
2.18
2.18
D
E
Trapezoidal, external and internal
MJ, external
No. of
Pitch Threads/inch
No. of
Pitch Threads/inch
infeeds
Reduce cutting speed
infeeds
Reduce cutting speed
1.5
2.0
3.0
4.0
5.0
6.0
7.0
1.5
G
H
1
0.20 0.25 0.27 0.31 0.34 0.37 0.37
1
0.23
0.25
2
0.20 0.23 0.24 0.26 0.31 0.34 0.33
2
0.21
0.23
3
0.16 0.18 0.20 0.22 0.25 0.30 0.31
3
0.16
0.17
4
0.13 0.15 0.16 0.19 0.23 0.27 0.28
4
0.14
0.15
5
0.11 0.13 0.14 0.17 0.21 0.25 0.25
5
0.12
0.13
6
0.08 0.12 0.12 0.17 0.20 0.24 0.25
6
0.08
0.12
7
0.90 0.10 0.12 0.15 0.19 0.21 0.25
7
0.94
0.10
8
0.09 0.11 0.14 0.19 0.21 0.23
8
9
1.25 0.11 0.14 0.17 0.21 0.21
10
0.10 0.14 0.15 0.19 0.21
11
0.10 0.13 0.14 0.17 0.21
12
0.08 0.12 0.13 0.16 0.19
13
1.75 0.10 0.12 0.16 0.18
14
2.24 0.10 0.15 0.16
15
2.73 0.14 0.16
16
0.12 0.12
3.49 3.71
C 30
2.0
Radial infeed per pass, mm
Radial infeed per pass, mm
F
4
0.08
1.23
Turning
UNJ, external
No. of
Pitch Threads/inch
infeeds
32
28
24
Reduce cutting speed
20
18
16
14
12
10
8
Radial infeed per pass, mm
1
0.17 0.17 0.18 0.20 0.23 0.23 0.23 0.27 0.27 0.30
2
0.16 0.14 0.16 0.17 0.19 0.20 0.21 0.24 0.25 0.28
3
0.12 0.10 0.15 0.14 0.15 0.15 0.16 0.19 0.19 0.21
4
0.08 0.10 0.11 0.11 0.13 0.13 0.13 0.16 0.16 0.17
5
0.53 0.08 0.08 0.10 0.11 0.10 0.12 0.14 0.14 0.16
6
0.59 0.68 0.08 0.08 0.10 0.10 0.11 0.13 0.14
7
0.80 0.89 0.08 0.09 0.10 0.12 0.13
8
0.99 0.08 0.08 0.10 0.12
9
1.12 1.29 0.10 0.12
10
0.08 0.11
11
1.54 0.10
12
0.08
13
1.92
A
B
C
14
15
16
D
NPTF, external
NPTF, internal
No. of
No. of
infeeds
Pitch Threads/inch
infeeds
Reduce cutting speed
27
18
14
Reduce cutting speed
14
11.5 8
Radial infeed per pass, mm
E
Pitch Threads/inch
11.5
Radial infeed per pass, mm
0.25
0.25
8
1
0.18 0.22 0.25 0.25 0.25
1
0.25
2
0.15 0.20 0.23 0.24 0.24
2
0.23
0.24
0.24
3
0.12 0.15 0.16 0.20 0.23
3
0.16
0.20
0.23
4
0.10 0.13 0.15 0.16 0.20
4
0.15
0.16
0.20
5
0.09 0.11 0.13 0.14 0.18
5
0.13
0.14
0.18
6
0.08 0.10 0.12 0.12 0.16
6
0.12
0.16
0.16
7
0.72 0.09 0.11 0.11 0.15
7
0.11
0.11
0.15
8
0.08 0.10 0.11 0.14
8
0.10
0.11
0.14
9
1.08 0.10 0.10 0.13
9
0.10
0.10
0.13
10
0.08 0.10 0.12
10
0.08
0.10
0.13
11
1.43 0.10 0.12
11
1.43
0.10
0.12
12
0.08 0.12
12
0.08
0.12
13
1.71 0.11
13
1.71
0.11
14
0.11
14
0.11
15
0.10
15
0.10
16
0.09
16
0.09
2.45
F
G
H
2.46
Note! When using grade CB20 max infeed value should be 0.07 mm.
C 31
Turning
API thread forms
Insert
Total
infeed
A
B
No. of infeed/
Radial infeed per pass, mm
1
2
3
4
5
6
7
8
9
10
11
12
API-Buttress
R 166.0G-22BU01-050
R 166.0L-22BU01-050
1.65
0.30 0.25 0.17 0.15 0.12 0.12 0.12 0.12 0.12 0.10 0.08
R 166.0G-22BU01-0501
R 166.0L-22BU01-0501
1.65
0.30 0.25 0.17 0.15 0.12 0.12 0.12 0.12 0.12 0.10 0.08
VAM
R166.0G-22VA01-080
R166.0L-22VA01-080
1.06
1.11
0.27 0.23 0.18 0.12 0.11 0.08 0.07
0.28 0.24 0.18 0.13 0.11 0.09 0.08
R166.0G-22VA01-060
R166.0L-22VA01-060
1.06
1.11
0.27 0.23 0.18 0.12 0.11 0.08 0.07
0.28 0.24 0.18 0.13 0.11 0.09 0.08
R166.0L-22VA01-050
1.65
0.30 0.25 0.17 0.15 0.12 0.12 0.12 0.12 0.12 0.12 0.10 0.08
1.30
1.30
1.83
0.28 0.24 0.18 0.18 0.14 0.11 0.09 0.08
0.28 0.24 0.18 0.18 0.14 0.11 0.09 0.08
0.30 0.24 0.18 0.15 0.13 0.13 0.13 0.13 0.13 0.12 0.11 0.08
R166.0G-22RD01-100
R166.0L-22RD01-100
1.48
0.29 0.24 0.16 0.14 0.12 0.12 0.12 0.11 0.10 0.08
R166.0G-22RD01-080
R166.0L-22RD01-080
1.88
0.30 0.25 0.19 0.16 0.14 0.14 0.13 0.13 0.13 0.12 0.11 0.08
13
14
15
13
14
15
New VAM
R166.0L-22NV01-080
R166.0L-22NV01-060
R166.0L-22NV01-050
C
API Rd
D
API thread forms
E
Insert
Total
infeed
F
3
4
5
6
7
8
9
10
11
12
0.45 0.38 0.38 0.34 0.30 0.30 0.26 0.26 0.19 0.12 0.10 0.08
R 166.0G-22V381-0403
R 166.0L-22V381-0403
3.15
0.45 0.38 0.38 0.34 0.30 0.30 0.26 0.26 0.19 0.12 0.10 0.08
3.82
0.45 0.38 0.36 0.34 0.30 0.30 0.28 0.26 0.24 0.22 0.20 0.19 0.12 0.10 0.08
3.81
0.45 0.38 0.36 0.34 0.30 0.29 0.28 0.26 0.24 0.22 0.20 0.19 0.12 0.10 0.08
3.06
0.44 0.37 0.37 0.33 0.29 0.29 0.25 0.24 0.18 0.12 0.10 0.08
API-V-0.040
R166.0G-22V401-0503
R166.0L-22V401-0503
C 32
2
3.16
R166.0G-22V501-0403
R166.0L-22V501-0403
H
1
API-V-0.038R
R 166.0G-22V381-0402
R 166.0L-22V381-0402
API-V-0.050
R 166.0G-22V501-0402
R 166.0L-22V501-0402
G
No. of infeed/
Radial infeed per pass, mm
Turning
Multi point, external
No. of
infeeds
ISO metric
ISO inch
Pitch, mm
1.0
1.5
Whitworth
NPT
Pitch, t.p.i.
2.0
2.5
3.0
20
18
16
14
12
19
14
11
11.5
Radial infeed
per pass, mm
0.36 0.36 0.48 0.46 0.55
0.44 0.49 0.39 0.44 0.52
0.48 0.47 0.45
0.50
1
0.32 0.33 0.47 0.44 0.53
0.39 0.44 0.35 0.41 0.48
0.43 0.43 0.43
0.48
2
0.68 0.27 0.33 0.40 0.47
0.83 0.93 0.29 0.32 0.36
0.91 0.33 0.39
0.44
3
0.96 1.28 0.28 0.34
1.03 1.17 1.36
1.23 0.27
0.25
4
1.58 1.89
1.54
1.67
A
B
Multi point, internal
No. of
infeeds
ISO metric
ISO inch
Pitch, mm
Pitch, t.p.i.
1.0
1.5
Whitworth
2.0
16
12
19
14
NPT
11
C
11.5
Radial infeed
per pass, mm
1
0.33
0.34
0.46
0.36
0.48
0.35 0.47 0.45
0.50
2
0.30
0.31
0.42
0.39
0.44
0.31 0.43 0.43
0.48
3
0.63
0.25
0.32
0.26
0.34
0.25 0.33 0.39
0.44
0.90
1.20
0.95
1.26
0.91 1.23 0.27
0.255
1.54
1.675
4
D
E
F
G
H
C 33