Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 363)

Coordinate Control
Chapter 13
13-11
The control has a number of features that operate in specific planes. For
that reason it is frequently necessary to change the active plane using a
G17, G18, or G19.
Some of the features that are plane dependant are:
Circular interpolation
Cutter compensation
Work Coordinate system rotation
Many fixed cycle operations
Important: The system installer determines the planes defined by G17,
G18, and G19 in AMP. Axes may not be assigned to the planes exactly as
listed below. Refer to the documentation prepared by the system installer.
Typical axis names and their corresponding plane assignment are shown
below:
G17 -- plane defined by the X and Y axes (or axes parallel to X and Y)
G18 -- plane defined by the Z and X axes (or axes parallel to Z and X)
G19 -- plane defined by the Y and Z axes (or axes parallel to Y and Z)
Planes can be altered to accommodate additional axes parallel to the
principle axes by programming those axes in the G17, G18, or G19 block.
See Example 13.4.
Example 13.4
Altering Planes for Parallel Axes
Assuming the system installer has made the following assignments in AMP:
G17 -- the XY plane.
U axis -- parallel to X axis
V axis -- parallel to Y axis
Program block Plane selected Axis Motion
G17; selects XY plane None
G17 U0; selects UY plane U axis moves to zero
G17 V0; selects XV plane V axis moves to zero
G17 U0V0; selects UV plane U & V axes move to zero
13.2
Plane Selection (G17, G18,
G19)