Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 530)

Dresser/Wheel Radius Compensation
Chapter 15
15-42
The following subsections cover possible paths that can be generated when
programming one of these during radius compensation:
Changing radius compensation direction (cross-over dresser/wheel
paths)
Exceeding the allowable number of consecutive, non-motion blocks
during radius compensation
Corner movement following a generated block
Changing dresser/wheel radius during radius compensation
Effect on radius compensation when interrupting a program to execute
either a MDI program or a manual move
Changing or offsetting current work coordinate system during radius
compensation
Moving to and from machine home and secondary machine home
This section describes the resulting path when you program a change in
compensation direction (left or right). This can result in the dresser/wheel
crossing over the programmed path as compensation changes from left to
right or right to left.
Linear Path-to-Linear Path
Example 15.9 through Example 15.12 show the path taken when you
change radius compensation from G41 to G42 during the execution of two
linear program moves.
The control generates two points when changing radius compensation
direction:
point 1
This is the final dresser/wheel position before compensation direction is
changed (at right angles to the end-point of the programmed path offset
by one dresser/wheel radius).
point 2
This is the desired dresser/wheel position for the start of the first block
using the changed compensation direction (at right angles to the
start-point of the motion block that changes compensation direction and
offset by the dresser/wheel radius).
15.7
Special Compensation
Cases
15.7.1
Changing Compensation
Direction