Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 88)

Offset Tables and Setup
Chapter 3
3-14
There are two types of data that are entered in the work coordinate system
table. One is the initial work coordinate system zero point locations that
are called when programming G54-G59.3. The other is the external offset,
used to offset all of the G54-G59.3 zero points to make the same set of
work coordinate systems fit a variety of applications.
Zero Point Parameters
The work coordinate system parameters refer to the zero point locations of
all of the work coordinate systems called out by G54-G59.3. Enter
positions for these zero points as machine coordinate values. The specified
machine coordinate position is then used by the control as the work
coordinate system zero point.
Enter a machine coordinate system position for each of the work
coordinate systems as described in section 3.3.3.
External Offset
The external offset is used to modify all of the work coordinate system
zero points. Use of the external offset is optional. The value entered here
will offset all of the work coordinate systems by the specified amount.
Enter external offsets in the work coordinate system tables as the external
offset value.
This offset is used to allow a programmer to use the same set of work
coordinate system values in a variety of applications. Adjusting this value,
for example, will allow for use of the same work coordinate systems and
programs after a different part or tool mounting fixture has been installed
on the machine. It can also be used to offset all work coordinate systems
when part programs are transferred from different machines with different
mechanical features.
3.3
Work Coordinate System
Offset Tables {WORK
CO-ORD}