Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 397)

Chamfering and Corner Radius
Chapter 16
16-7
You must program ,C and ,R in blocks that contain axis motion in the
current plane. If they are programmed in a block that does not contain
axis motion in the currently active plane, the control generates an error.
,C and ,R cannot be programmed in a block that contains any of the
following:
- Any fixed cycle G-codes
- Any dwell commands
- Thread cutting blocks
- Programmable zone G-codes
Your system installer determines in AMP the resolution of the ,C- and
,R-words for both inch and metric programming. Refer to
documentation prepared by your system installer for details.
END OF CHAPTER