Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 331)

Coordinate System Offsets
Chapter 11
11-15
CAUTION: G92 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.
Example 11.6 shows the effect of changing work coordinate systems while
the G92 offset is active.
Example 11.6
Changing Work Coordinate Systems With Offset Active
Program Comment
N1 G10L2P1X0Y0; Define G54 work coordinate system zero
point to be positioned X0, Y0 away from the
machine coordinate system
N2 G10L2P2Y20.X25.; Define G55 work coordinate system zero
point to be positioned Y20, X25 away from
the machine coordinate system
N3 G55Y10.X5.; Move to Y10, X5 in the G55 work coordinate
system
N4 G54Y10.X5.; Move to Y10, X5 in the G54 work coordinate
system
N5 G92Y-5.X-5.; Offset current tool position to be at Y-5,
X-5
N6 Y15.X0.; Move to Y15, X0 (offset still active)
N7 G55Y10.X5.; Move back to Y10, X5 in the G55 work
coordinate system with the G92 offset still
active