Rockwell Automation 8520-GUM 9/Series CNC Grinder Operation and Programming Manual Documentation Set - Manual (Page 215)

Running a Program
Chapter 7
7-27
Use the jog retract feature to inspect, dress, or change the grinding wheel
during automatic program execution. It allows the grinding wheel to be
jogged from the workpiece in multiple steps, and then returned to the
workpiece automatically by having the control retrace the jogging steps
that were used.
The control remembers up to 15 jog retract moves. The actual number of
moves retained can vary from 0 to 15 as determined by an AMP parameter
set by your system installer. The control returns the wheel along the jog
retract path at a feedrate specified in AMP.
Important: If you use the same axis in succession during a jog retract
operation, the control assumes that only one jog retract move has been
executed on that axis.
You can perform only simple single axes jog moves during the jog retract
function. You are not allowed to perform multiple axis jogs, arbitrary
angle jogs and jogging offset.
You can change wheel offsets at any time during jog retract (see page 3-4
for wheel offset). The control does not make these offsets active until the
execution of the first block after the wheel has been returned from jog
retract.
ATTENTION: If you deactivated the jog retract function
during its execution (performing a control reset, E-Stop, etc.),
attempting to return the wheel by pressing cycle start can cause
an undesired return path. The wheel returns to the start point of
jog retract along a linear path. This is most likely not the
retracted path. To avoid possible part or wheel damage, we
recommend the grinding wheel be jogged to the point from
which jog retract was started prior to pressing cycle start.
To perform a jog retract operation:
1. Press the <CYCLE STOP> button or the <SINGLE BLOCK> button to stop
program execution.
2. Press the <JOG RETRACT> button. The light inside the button turns on
to indicate that the function is active.
3. Move the grinding wheel from the workpiece using either continuous
jog, incremental jog, or HPG jog operations (see page 4-1 for
jogging information).
7.9
Jog Retract