Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 541)

Chapter
22
22-1
Single-Pass Turning Cycles
Single-pass turning cycles consist of these cycles:
G20 Single-pass O.D. and I.D. roughing cycle
G24 Single-pass rough facing cycle
G21 Simple threading cycle
This chapter describes the following major topics:
Topic: On page:
G20 22-1
G24 22-8
These cycles are called single-pass cycles because each time the cycle is
executed, it makes only one cutting pass over the workpiece. Typically
single-pass cycles are modal and repeat after any block that commands
axis motion.
It is possible for the system installer to select in AMP the option to repeat
the cycle after every block following the single-pass cycle block. If your
control is configured this way, the motions of the last executed single-pass
cycle repeat after every program block until the cycle is cancelled.
This manual assumes that the system is configured to repeat the cycle only
after blocks commanding axis motion (very similar to the drilling cycles
described in chapter 26).
Cancel single-pass cycles by programming a different G-code in the same
modal group. See G-code table in appendix C. G-codes in the same group
include G00, G01, G02, G03, G33, and G34.
Single-pass cycles can be programmed in either diameter or radius mode.
For the purpose of explanation, examples in this section are given in the
radius programming mode. When programming in diameter mode,
remember that the value entered for the X axis is half the actual motion for
that axis. Single-pass cycle examples in this manual are programmed in
absolute programming mode. Incremental mode may be used if desired.
Use the G20 cycle to cut the diameter of a part while using the G24 cycle
to cut the part’s face.
22.0
Chapter Overview