Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 335)

Coordinate System Offsets
Chapter 11
11-19
The jog offset feature allows the operator to manually create a desired
offset by jogging the axes during an automatic or MDI operation.
Important: This feature will function only if the system installer has
supplied a special switch and the appropriate PAL programming. See the
“Jog Offsets” and “Jog-on-the-fly” PAL flags in your PAL reference
manual or else refer to the documentation supplied by the system installer.
This feature is activated by pressing a special switch after interrupting an
automatic or MDI operation. Any manual jog moves made will be added
to the current work coordinate position as an offset. When cycle start is
pressed to continue execution, the jogged distance for each axis will
remain as a coordinate offset for that axis.
CAUTION: Jog offsets are global. This means that changing
from one coordinate system to another does not cancel the
offset. Do not specify a change in coordinate systems
(G54-G59.3) unless the effects of the offset have been
considered.
The Jog offsets can be canceled by programming a G92.1 command,
executing a control reset operation, executing an E-STOP reset operation,
or programming an end of program M30 or M02 command.
To use this feature follow these steps:
1. Press <CYCLE STOP> or <SINGLE BLOCK> on the MTB panel to
interrupt automatic or MDI operation.
2. Turn on the switch to activate the jog offset function (refer to
documentation provided by the system installer)
.
3. Change to manual mode unless the control is equipped for the
“Jog-on-the-Fly” feature which allows jogging in automatic or MDI
modes (refer to documentation prepared by the system installer).
4. Jog the axes using any of the available jog types (with the exception
of homing) as described in section 4.1. The control will add the
amount of the jog move as an offset for each jogged axis.
11.4.4
Jogging an Offset