Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 362)

Coordinate Control
Chapter 13
13-10
The work coordinate systems are all rotated as soon as the external rotation
feature is activated. The current work coordinate system can be changed
while an External Part Rotation is active. If changed, the new work
coordinate system will be rotated as described by the External Part
Rotation parameters.
The “PROGRAM” and “TARGET” position displays (as discussed in
section 8.1) will not reflect an external part rotation since these values are
relative to the active work coordinate system.
Since “ABSOLUTE” position displays always show coordinates relative to
the machine coordinate system, they will reflect an external part rotation.
External Part Rotation Parameters
This table describes the parameters you use for external part rotation:
If you want to: Use this parameter: In this way:
select a plane plane Enter the axis names that define the plane to be rotated. Two separate values must be
entered on this line. The first axis entered here is the axis that the angle of rotation is
measured from. This parameter must match the active plane. If the external and
program-selected planes do not match, the control generates a block decode error.
define the center of
rotation center Enter a coordinate value for each axis in the selected plane. The center of rotation is a
point on the machine coordinate system about which all the work coordinate systems will
be rotated. The default value for the center of rotation is (0, 0).
define the vector vector Enter a coordinate value to define the “head”of the vector. The “tail”of this vector is the
center of rotation. This parameter is optional. If you use the angle parameter, that value
overrides this value. The resulting angle between this vector line and the first plane axis
is the angle of rotation for the work coordinate system All work coordinate systems
rotate about the point defined by the center parameter. The default values are (0, 0).
With the values of this parameter, the control calculates the angle of rotation and
displays this value in the angle parameter.
define the angle of
rotation angle Enter the angle at which that you want to rotate the work coordinate system. This value
overrides the value of the vector parameter. Enter a positive value for clockwise rotation
from the primary axis of the selected plane. If you do not enter a value the control
displays the angle defined by the vector parameter.