Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 319)

Chapter 11
Coordinate System Offsets
11-13
This section describes the more temporary ways of offsetting the work
coordinate systems. These offsets are activated through programming, and
they are canceled when you remove power to the control. They may also
be cancelled by an M02, M30, or control reset, depending upon the
selections made in AMP by your system installer.
Important: All of these offsets are global in nature. This means that they
apply to all work coordinate systems. When you change work coordinate
systems (programming G54-G59) consider the effects of these offsets on
the new work coordinate system.
Tool geometry and wear offsets are not effected by an offset made to the
work coordinate system.
Important: We recommend that tool offsets for geometry and wear be
canceled before you execute any work coordinate system offsets. If tool
offsets are not canceled, the work coordinate system offset is added to the
active tool offset. This can cause confusion when you change tool offsets
later in the program. See page 20-5 on canceling tool offsets.
Use the G92 command in a part program to offset the currently active work
coordinate system relative to the current tool position. A G92 block in a
program offsets the zero point of the work coordinate system a specified
distance from the current tool position.
G92.2 cancels G92 without canceling any other work coordinates. This
differs from G92.1, which cancels all coordinate system offsets. A control
reset may cancel this offset, depending upon the selections made in AMP
by your system installer.
When a G92 command is executed in a program, it cancels any other active
work coordinate system offsets that may have been in effect including G52
offsets, jogged offsets, or set zero offsets. External offsets are not affected.
When the PAL flag $INHR is set, it cancels G92.
Important: A tool offset is not automatically canceled when you execute a
G92 block. This can result in undesired effects on the work coordinate
system when tool offsets are changed later.
The following G92 block offsets the work coordinate system so that the
current tool position takes on the coordinate values programmed in the
G92 block.
G92 X___ Z___;
11.4
Offsetting the Work
Coordinate Systems
11.4.1
Coordinate Offset Using
Tool Position (G92)