Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 482)

Dual Axis Operation
Chapter 19
19-8
Set Zero
A set zero operation may be performed on the axes in a dual group on an
individual basis. For example, if you have a dual axis named X and it
consists of two axes, X1 and X2, when the set zero operation is executed
through PAL, you must specify which axis in the dual group to set zero.
When the set zero operation is performed on an axis, the current axis
location becomes the new zero point of the coordinate system.
Cutter Compensation
Only one tool diameter may be active at any one time. Any offset created
by cutter compensation affects all axes in the dual group.
Tool Length Offsets
The system installer must select one of the dual axis group members as the
tool length axis in AMP if separate tool length offsets are to be used for a
dual group. Once one axis of the group has been assigned as the tool
length axis, all axes in the group may have independent tool length values
assigned to them.
Assuming tool length offsets are valid on your dual axis, their activation is
the same as the tool length offset on non-dual axes. Refer to chapter 20 for
details.
The offset function is selected with G43, G44, and G49. The offset value
to activate is selected with an H word. This H word is the offset number
and used for all axes in the dual group. The tool length offset values called
by this H word, however, may be assigned individually. These values may
be assigned either :
manually through the tool wear and geometry tables as discussed in
chapter 4.
automatically through programming the correct G10 codes as discussed
in section 11.2.1.