Rockwell Automation 8520 9/Series CNC Lathe User Manual
Page 452
Dual Axis Operation
Chapter 19
19-4
CAUTION: Be careful when an axis is unparked. Any
incremental positioning requests you make to the dual axis
group are referenced from the current location of all axes in the
dual group. This includes any manual jogging or any
incremental part program moves. When an axis is unparked, we
recommend you make the next command the dual axis group be
an absolute command to realign the axes in the dual group to
the same position.
Perform an axis park in a dual group through PAL. Refer to your system
installer’s documentation for details on how axes are parked.
Important: Some systems can have special parking requirements when
homing axes in a dual group. See section 19.2 for details on homing dual
axes.
There are two methods to home axes in a dual axis group. Your system
installer determines through PAL which method is available. The two
methods are:
home each axis in the dual group individually
home all axes in the dual group simultaneously
Both of these homing methods can be available for automatic (G28) as
well as manual homing operations.
Your system installer can also define independent speeds and home
positions for each axis in a dual group through AMP. This applies to both
homing methods. Refer to your system installer’s documentation for
details on these speeds and locations.
Homing Axes Individually
This method requires that each axis be homed individually. When a
manual home operation is performed, a home request must be made to
each axis in the dual group on an individual method. Refer to chapter 4 for
details on how to request a manual home operation.
When you use automatic homing (G28), the axes must be homed one at a
time. This is accomplished by parking all other axes in the dual axis group
except the axis that is to be homed and requesting that the AMP-assigned
master axis name be homed in the G28 block. Once homed, that axis
should be parked, the next axis to be homed should be unparked, and the
homing procedure repeated. Refer to chapter 14 for details on how to
request an automatic home operation (G28).
19.2
Homing a Dual Axis