Threading Thread Turning
Calculation Method for Helix Angle
✓
Length of one rotation
Pitch diameter
Helix angle Pitch Pitch diameter Number of threading starts
* When λ approaches β, it can effectively improve the precision of threading and prevent cutting edge breakage. Through calculation, it is very important to choose the appropriate Angle of the shim.
Recommended Cutting Parameters
Cutting speed (m/min)
Brinell Hardness （HB）
Materials
AP220E
AP220U AP020H AP120S
Unalloyed steel
120-170
60-200
60-200
Low-alloyed steel
180-350
60-160
60-160
High-alloyed steel
200-325
50-120
50-120
Ferritic, Stainless steel
200-325
60-130
60-130
Austenitic, Stainless steel
180-200
40-140
40-140
Malleable cast iron
130-230
60-150
60-150
Grey cast iron
180-260
70-130
70-130
Nodular cast iron
160-250
90-160
90-160
Titanium alloy
200-375
50-70
Heat resistant alloys
200-350
15-50
Hardened steels
45-55HRC
40-50
600
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