Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 601)

Chapter
25
25-1
Thread Cutting
The 9/Series control provides two methods of thread cutting:
Single-pass thread cutting
G33 and G34 blocks generate a single thread cutting pass. G33 can cut
straight, tapered, face, multistart, and multiblock threads. G34 can cut
thread passes of increasing or decreasing leads.
Automatic thread-cutting cycles
G21 and G78 provide for fully automatic thread cutting with multiple
passes at a programmed depth, including springing pass and clean-up
pass options.
This chapter describes the following topics that relate to thread cutting:
Topic: On page:
Considerations for thread cutting 25-2
Chamfering your threads 25-4
Single pass threading mode 25-6
Single pass variable lead thread cutting 25-12
Single pass threading cycle 25-16
O.D. & I.D. multipass threading routine 25-20
If you are using a dual-processing system, you may need to use slightly
different threading methods. Refer to page 30-15 for details.
Important: Descriptions in this chapter are written assuming the control is
in the G18 plane and that plane has been defined as the ZX plane. If your
system has a different plane active, operation of these features is different.
Parameters are defined here assuming Z is the first axis in the plane, and X
is the second axis in the plane. If, for example, the XZ plane is the
currently active plane, descriptions in this document should be interpreted
accordingly (i.e., Z axis description applies for X axis and X axis
description applies to Z axis. See your system installer’s documentation
for details on the plane definitions on your system.
25.0
Chapter Overview