Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 308)

Coordinate System Offsets
Chapter 11
11-2
Once you establish, the machine coordinate system is not affected by a
control reset operation or any other programming or operator operation.
Figure 11.1
Machine Coordinate System, Home Coordinate Assignment
Chuck
Machine Coordinate System
zero point
+Z
+X
Mechanically fixed
Machine Home
point
15
10
In Figure 11.1, your system installer defined the machine coordinate
system zero point by assigning the machine home point to have the
coordinates X=10 and Z=15.
The coordinate values assigned to the machine home point do not affect the
position of machine home. The position of machine home is fixed by your
system installer.
Important: Normally, the control displays the current axes positions in
respect to active work coordinate system. The position in the machine
coordinate system can be displayed by selecting the absolute screen as
described in chapter 8.