Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 557)

Surface Grinding Fixed Cycles
Chapter 16
16-7
The Plunge
Plunge refers to the axis motion towards the part surface. You can specify
two plunge pick increments:
the plunge pick at start and
the plunge pick at crossover
Parallel Axes
You can use parallel axes in the surface grinding cycle blocks in place of the
primary axes to which they are parallel. For example, you can program:
G19VZ;
G83X__I__V__J__Z__K__;
where the Y axis has been replaced with its parallel axis, V. The integrand
for the Y axis, J, is used for the V axis. The active plane becomes the VZ
plane where V is axis 1 and Z is axis 2 of the plane.
The cycle begins with a reciprocating move (X axis) followed by a cross
pick move (Z axis) that begins as the X axis decelerates. After the entire
crossover is completed, a plunge move (V axis) is made, again beginning
as the X axis decelerates. See the description of the G83 cycle for details
on cycle operation.
Block Displays while Executing Grinding Fixed Cycles
When executing part program blocks, the main screen of the control
displays a “*” before a block it is executing and a “@” before a block it
has completed. This is typical of any block executed on the control.
Be aware that when block execution involves the reciprocation axis, the
block may appear to be handled differently, but actually is not. What
frequently happens is that the “@” appears before a grinding fixed cycle
block and a “*” appears before the block that follows it even though that
block is being held in pre-block. It is being held while waiting for the
reciprocation axis to reach its secondary reversal point.
Similarly, the G code display may show the G code of the following block
as active when, again, that block is being held in pre-block waiting for the
reciprocation axis to move to its secondary reversal point.