Threading Solutions - Vargus

Minimum Bore Diameters for Thread Milling (Con’t)
Toolholder
Ordering Code
Pitch mm
Pitch tpi
D2
0.5
48
0.6 0.7 0.75
0.80
44 36 32
0.9
1.0
28 26
24
1.25
20
19
1.5
18
16
1.75
14
2.0
13
12
11.5
11
2.5
10
3.0
9
8
Minimum Bore Diameter Di in.
3.5
7
4.0
6
4.5
5.0 5.5 6.0
5
4.5
4
TM2C 150-6B
2.05
2.48
2.52
2.60
2.64
2.66
2.72
2.76
TMSH D250-075-3B
2.48
2.50
2.51
2.52 2.52
2.54
2.56
2.60
2.64
2.66
2.68
2.72
TMSH D250-075-5
2.48
2.50
2.51
2.52 2.52
2.54
2.56
2.60
2.64
2.66
2.68
2.72
2.76
2.83
2.87
2.91
2.95
TMSH D300-100-5
3.15
3.17
3.18
3.19 3.19
3.21
3.23
3.27
3.31
3.33
3.35
3.39
3.43
3.50
3.54
3.58
3.62
TMSH D300-100-6B
3.15
3.58
3.62
3.70
3.74
3.76
3.82
3.86
TMSH D250-075-6B
2.48
2.64
2.66
2.68
2.72
2.76
2.83
2.87
2.91
2.95
3.03
3.07
3.09
3.15
3.19
TMSH D400-125-5
3.94
3.96
3.96
3.97 3.98
4.00
4.02
4.06
4.09
4.11
4.13
4.17
4.21
4.29
4.33
4.37
4.41
TMSH D400-125-6B
3.94
4.37
4.41
4.49
4.53
4.55
4.61
4.65
TMSH D500-150-5
4.92
4.94
4.95
4.96 4.96
4.98
5.00
5.04
5.08
5.10
5.12
5.16
5.20
5.28
5.31
5.35
5.39
TMSH D500-150-6B
4.92
5.35
5.39
5.47
5.51
5.54
5.59
5.63
Coarse Pitch Tooling:
This table is not applicable to the Coarse Pitch system, which can thread mill bores smaller than those
listed above. See the Coarse Pitch section of the various thread standards.
Troubleshooting
Problem Possible Cause Solution
Increased
Cutting speed too high
Reduce cutting speed/use coated insert
TM Technical Data
insert
flank wear
Chipping of
cutting edge
Chip is too thin
Insufficient coolant
Chip is too thick
Vibration
Increase feed rate
Increase coolant flow rate
Reduce feed rate/
Use the tangential arc method/
Increase RPM
Check stability
Material
Build up
on the
Incorrect cutting speed
Unsuitable carbide grade
Change cutting speed
Use a coated carbide grade
Cutting edge
Chatter /
Vibration
Feed rate is too high
Profile is too deep
Reduce the feed
Execute two passes, each with increased cutting depth/
Execute two passes, each cutting only half the thread length
Thread length is too long
Execute two passes, each cutting only half the thread length
GO NOGO Insufficient
thread
accuracy
Tool deflection
Reduce feed rate/
Execute a “zero” cut
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