Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 606)

Thread Cutting
Chapter 25
25-6
The G33 thread cutting mode can cut straight, tapered, face, and multistart
threads that have constant thread leads (use G34 to cut threads that do not
have a constant lead). The G33 thread cutting mode is a mode, not a cycle
and does not generate any extra motion blocks. This mode synchronizes
the thread cutting tool motion with the spindle to allow programming
multiple passes over the same threads.
Figure 25.3
Constant Lead Threads
Parallel thread
Face thread
Tapered thread
The format for the G33 thread cutting operation is:
Parallel thread G33Z__ F__ Q__;
E
Tapered thread G33X__Z__ F__ Q__;
E
Face thread G33X__ F__ Q__;
E
25.3
Single Pass Threading Mode
(G33)