Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 546)

Dresser/Wheel Radius Compensation
Chapter 15
15-58
If compensation was not canceled using a G40 command before returning
to machine or secondary home points, the control automatically
re-initializes dresser/wheel radius compensation for the return from
machine or secondary home points. This is done by using the move to the
intermediate point, as designated when the operation was performed, as an
entry move for compensation.
Figure 15.51 gives an example of either a G28 or G30 block followed by a
G29 block.
Figure 15.51
Dresser/Wheel Radius Compensation During G28, G30, and G29 Blocks
Temporary cancel of
compensation here
at intermediate point
Reference point
Programmed
path
G41
N11 N12
N13
N13’
N14’
N15
N14
r
r r
r
r r
r r
12141-I
We recommend that you cancel dresser/wheel radius compensation using a
G40 command before you make any modifications to the current work
coordinate system, including any offsets or any change of the coordinate
system (G54-G59.3).
If compensation is not canceled using a G40 command, the control
automatically, temporarily cancels compensation for the change in work
coordinate system. This is done by using the last compensated move in the
current coordinate system as an exit move for compensation.
15.7.7
Changing or Offsetting Work
Coordinate System in
Dresser/Wheel Radius
Compensation