Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set User Manual
Page 543
Dresser/Wheel Radius Compensation
Chapter 15
15-55
Figure 15.48 shows an example of a typical change in dresser/wheel radius
during jog retract with radius compensation active:
Figure 15.48
Change in Dresser/Wheel Radius During a Jog Retract
Original
dresser/wheel
radius
New
dresser/
wheel
radius
Difference in
dresser/wheel radius
Δ
R
Programmed path
Compensated path
Jog retract moves
Jog retract
return moves
dresser/wheel
radius
changed here
90
°
Generated offset block
from difference in
dresser/wheel radius
Δ
R
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12139-I
If exiting automatic mode, and if either an MDI motion block is executed
or a manual jog motion is made, the radius compensation feature, if active,
is re-initialized when the next motion block is executed in automatic mode.
The compensation feature compensates the dresser/wheel one radius
perpendicular to the path of the next motion block that is executed in
automatic mode. In effect, the control generates its own entry move for
compensation with the first compensated block being the next block
executed in automatic operation.
Important: The dresser/wheel radius compensation feature is not available
for any motion blocks that are programmed in MDI mode. The
dresser/wheel radius compensation mode can be altered by programming
either G41, G42, or G40, or the dresser/wheel radius can be changed in an
MDI program. However, none of the paths executed in MDI are
compensated. Any changes made to dresser/wheel radius compensation
are not applied until the next block executed in automatic mode.
15.7.5
MDI or Manual Motion
During Dresser/Wheel
Radius Compensation