Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 498)

Tool Tip Radius Compensation (TTRC)
Function
Chapter 21
21-14
Figure 21.10
Results of Example 21.4
G41
Too many non-motion
blocks here
TTRC
reinitialized here
Programmed
path
r
r
r
r
r
Cancel the TTRC feature by programming G40. Refer to the path that is
taken when the tool leaves TTRC as the exit move. The path that the tool
follows during an exit move is dependant on:
The direction of compensation (G41 or G42).
The angle between the last motion made in TTRC (in the current
compensation plane) and the motion of the exit move.
Designating a tool offset number T00 in a program does not cancel TTRC
and does not generate an exit move. TTRC simply continues on as if a tool
radius had been changed to a radius of zero. See page 21-30 for
information about changing cutter radius. The exit move, if T00 is the
active tool radius, is the same path as the programmed tool path.
Important: An exit move cannot be a circular move (G02 or G03). Any
exit move must be programmed on a linear path. Any attempt to generate
an exit move by using a circular path generates a block-format error.
21.3.2
TTRC Type A Exit Moves