Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 611)

Thread Cutting
Chapter 25
25-11
Example 25.3
Multistart Thread Cutting
Thread lead: 2 threads/inch (.50 inch pitch)
Depth of cut: .7 inch (after final pass)
Number of cutting passes: 2 at 180 degrees apart
N1 M03 S50;
N2 G00 X1.5 Z2.2;
N3 X.9;
N4 G33 Z.8 E2. Q0;
N5 Z.5 X1.2
N6 G00 X1.5;
N7 Z2.2;
N8 X.9;
N9 G33 Z.8 E2. Q180;
N10 Z.5 X1.2
N11 G00 X1.5;
N12 Z2.2;
Figure 25.8
Multistart Thread Cutting Results from Example 25.3
180°shift angle between thread starts
End View