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THREAD MILLING USING CIRCULAR AND HELICAL INTERPOLATION

Introduction
Space
Feed Rate-Circular Interpolation
Space
Circular or Ramp Approach
Space
Helical Interpolation Review
Space
Thread Milling Using Circular and Helical Interpolation
Space
Feeds & Speeds
Space
Milling NPT Threads
Space
Thread Mill Product Notes

THREAD MILLING USING CIRCULAR AND HELICAL INTERPOLATION
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Program C and Figure B illustrate the programming of 360 of an 8 pitch thread using helical interpolation. Tool (T1) being a 1.500-8 TOSCO Thread Mill.

 

In Sequence N2, the X,  Y and Z axis position at rapid traverse to a clearance above the part (Position #0).
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In Sequence N3, the Z axis feeds to depth (Position #1).
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In Sequence N4, the cutter moves around the approach circle at 17.6 IPM (Position #2).
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In Sequence N5, the cutter continues around the approach circle to Position #3. The feedrate 17.6 IPM will give the same chip/tooth for the cutter going around the circle as 60 IPM does going in a linear move.
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In Sequences N6 through N9, the cutter feeds around the circle to Positions #4, #5, #6 and #7 at 27.2 IPM. Using helical interpolation, the Z word is the distance moved by the Z slide and the K word is the inches/radian value.
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In Sequence N10, the cutter feeds around the approach circle to Position #8.
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In Sequence N11, the cutter feeds to Position #9.
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In Sequence N12, the cutter is retracted to a clearance Position #0.
Figure B
Program C
Pos Seq G X Y Z I J K Feed
F
Speed
S
Tool
T
M
  01 G0                 T1 M6
0 N2   .0000 .0000 .0000              
1 N3 G1     -.9750       150.0 2500   M17
2 N4 G3 -.3125 .3125   .3125 .0000   17.6      
3 N5   -.6250 .0000                
4 N6   .0000 -.6250 -.9438 .0000 .0000 199 27.2      
5 N7   .6250 .0000 -.9126              
6 N8   .0000 .6250 -.8814              
7 N9   -.6250 .0000 .8502              
8 N10   -.3125 -.3125   -.3125 .0000 .0000        
9 N11 G1 .0000 .0000         150.0      
0 N12 G0     .0000             M9
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