Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 453)

Dual Axis Operation
Chapter 19
19-5
Homing Axes Simultaneously
This method allows a request for all axes in the dual group to be homed at
the same time. This does not mean that all axes reach home at the same
time. Keep in mind that your system installer can define different
feedrates and different home positions for each axis in the dual group.
With proper PAL programming, your system installer can configure all
axes in the dual axis group to home when the request is made to the master
axis. If you use this homing method, all unparked axes home together.
Refer to chapter 4 for details on how to request a manual home operation
and chapter 14 on how to request an automatic home operation (G28).
You can position axes in a dual axis group using any of the normal
programming or manual motion operations. Only the master axis name
can be requested to position a dual axis. Requests to position a dual axis
can be made in manual, automatic, or MDI mode.
For absolute and incremental moves, regardless of the start-point, each axis
in the dual group reaches the requested position (or travel the requested
distance) at the same time. For absolute moves, this means individual axis
feedrates can be modified, depending on the distance each axis must travel
from start to end of the requested move.
Your system installer can assign different maximum cutting, external decel,
and rapid feedrate limitations for each axis in a dual axis group. The
control uses the slowest feedrate for each of these features from any axis in
the dual axis group.
Special consideration must be given when programming these features:
Feature: Consideration:
Mirror Imaging Programmable mirror image is applied to all axes in the dual group. Manual
mirror image, however, can be applied to each axis in the dual group individually.
When manual mirroring is performed on selected axes in the dual group,
positioning commands are in effect reversed from the programmed commands to
the master axis. Manual mirror image is selected through PAL. Refer to the
system installer’s documentation and chapter 14 for details.
Scaling When scaling, specify the scale factor for the master axis of the dual group. All
other axes in the dual group are then scaled using the master axis scale factor.
Refer to chapter 13 for details.
Digitizing When generating program blocks using digitize, park all but one axis of the dual
axis group. Use this unparked axis to generate the axis positions for the digitize
feature. The blocks created are stored using the master axis name. Refer to
chapter 5 for details.
19.3
Programming a Dual Axis