Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 549)

Dresser/Wheel Radius Compensation
Chapter 15
15-61
Circular Departure Too Small
No intersection can be generated between two consecutive compensated
paths.
Figure 15.54
Typical Circular Departure Error
Programmed
path
Compensated
path
+
Compensated path necessary
to cut arc
Error is generated
because compensated
paths do not intersect
12144-I
Interference
This error occurs when compensation vectors intersect. Normally when
this intersection occurs, the control generates a backwards motion error;
however, a few special cases exist that are caught only by interference
error detection.