Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 425)

Spindles
Chapter 17
17-27
When using the synchronized spindle feature, remember:
you cannot retrace through a synchronization block (G45, G46, or
G46.1). However, you can retrace through blocks where
synchronization was already active.
in dual--process systems, both spindles used for synchronization
must be configured in the process that is programming spindle
synchronization. Shared spindles are acceptable if they area
already controlled by the process requesting synchronization.
gear changes are not allowed during synchronization. If spindle
speeds exceed the gear range of either spindle, the spindles will be
limited to the more restrictive spindle’s values.
due to the servo switch from open-- to closed--loop during
synchronization, a one--iteration hesitation in the spindles may be
seen when this switch occurs. This small deceleration may be
more apparent in systems with a smaller spindle motor or if
synchronization is done at higher speeds.
Program Restart, Mid--Start, and Interrupt Macros will be allowed.
If synchronization is disabled during an interrupt macro, it will
resynchronize upon return, in the event that all of the condition
checks listed in this section allow it to, otherwise a decode error
will result. Mid--Start and restart must also pass all conditions
described in this section.
you are responsible for selecting proper gear ranges prior to
activating synchronization.
The following features cannot be used while synchronization is active:
solid--tapping
Virtual C programming
The following features cannot be used while synchronization is ramping:
deep--hole peck drilling
threading
Important: Virtual C and threading are available on synchronized spindles
once synchronization is achieved.
17.7
Special Considerations for
Spindle Synchronization