Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 630)

Turning Operations
Chapter 18
18-14
Figure 18.11
Angular versus Plunge Infeed
Grinding Wheel Grinding Wheel
Angular Infeed Plunge Infeed
12070-I
When threading, you must program a small Z move to generate an angular
infeed.
The G33 single pass thread grinding mode grinds straight, tapered, face,
and multi-start threads that have constant thread leads (use G34 to grind
threads that do not have a constant lead). The G33 thread grinding mode is
a mode, not a cycle and does not generate any extra motion blocks. This
mode synchronizes the thread grinding motion with the spindle to allow
programming multiple passes over the same threads.
Figure 18.12
Constant Lead Threads
Parallel thread
Face thread
Tapered thread
12071-I
18.2.2
Single Pass Threading Mode
(G33)