Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 111)

Manual/MDI Operation Modes
Chapter 4
4-7
If you attempt to perform a manual gap elimination while dresser/wheel
radius compensation is active, a change in resulting contour can occur as
dresser/wheel radius compensation must be re-initialized at the end of
the manual gap elimination jog. Make sure no damage to the part or
grinding wheel occurs from this possible re-entry into dresser/wheel
radius compensation.
ATTENTION: The manual gap elimination feature should not
be used when programming in incremental mode (G91). Be
aware that incremental moves continue incrementally from the
endpoint of the manual gap elimination jog, not the original
start point of the move. Failure to consider these effects change
final part contour.
Performing Manual Gap Elimination
To perform manual gap elimination:
1. Select any of the available jogging types as described on page 4-1.
You cannot perform arbitrary angle jogs and manual homing
operations as manual gap elimination jogs.
2. Select the proper <SPEED/MULTIPLY> value. If you are performing
manual gap elimination in automatic or MDI mode, activate the Jog
on the Fly feature as described by your system installer’s
documentation.
ATTENTION: Do not jog the wheel beyond a point where
contact with the part is made. Doing so can cause damage to
the grinding wheel, the part, or personal injury.
3. Select and jog the axis with the <AXIS/DIRECTION> button or HPG.
Jog the axis to a point just before wheel contact with the part is made.
Important: You can jog only non-reciprocating axes using the manual gap
elimination feature. Any attempt to jog an axis that is reciprocating results
in an error.