Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 711)

In-process Dresser
Chapter 21
21-5
The following discussion only applies if your system installer has
configured you system to leave the in-process dresser on at the end of
program state. If the control is in the end of program state and the
in-process dresser is on, the in-process dresser offset is always applied to
the AMP defined vertical compensation offset axis (as though
reciprocation was on). The control enters the end of program state after
executing an M02 or M30 in either a part program or MDI program. An
M99 however will not cause the control to enter the end of program state.
An end of program state also occurs for MDI blocks when they are
completed and no part program is selected as active. For example:
MDI mode is: and a part program is: in- process dresser offset is applied:
executing active or inactive perpendicular to the current wheel path
completed active perpendicular to the last wheel path
completed inactive (none selected) to the AMP defined vertical dressing axis
Important: When the control transfers the in-process dresser offset that is
perpendicular to the wheel path, to the vertical axis or vice versa, wheel
motion relative to the part occurs. The direction and amount of this
relative motion is dependant on the surface you were grinding and the
amount of dressing that has occurred. If reciprocation is on the in-process
dresser offset always remains on the AMP defined dressing axis.
Part
Dresser offset vector swings between the
AMP defined dresser offset axis, and the
vector determined by the tool path when
transitioning between end of program
state, and program executing state.
Reciprocation off and motion in grinding wheel plane
Part
Reciprocation off and motion not in grinding wheel plane
Dresser Offset Vector
while grinding
Dresser Offset Vector
at end of program
ATTENTION: Damage to the part or machine can occur if care
is not taken as to the direction of the in-process dresser offset.
For example if you are at the end of program state and jog the
cutting tool against the part while the in-process dresser is on,
when you execute a program block the grinding wheel can
swing into, or away from the part when the offset swings off of
the AMP defined dressing axis. We recommend shutting the
in-process dresser off at the end program state.