Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 537)

Tool Tip Radius Compensation (TTRC)
Function
Chapter 21
21-53
Backwards Motion Detection
The compensated tool path is parallel to but in the opposite direction of the
programmed tool path.
Figure 21.47
Typical Backwards Motion Error
Programmed
Path
A
Compensated
Path
Compensated path
motion opposite of
programmed path
C B
D
A’ D’
B’ C’
Circular Departure Too Small
No intersection can be generated between two consecutive compensated
tool paths.
Figure 21.48
Typical Circular Departure Error
Programmed
path
Compensated
path
+
Compensated path necessary
to cut arc
Error is generated
because compensated
paths do not intersect