Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 424)

Spindles
Chapter 17
17-26
Activate Spindle Speed Synchronization (G46.1)
Use the “Activate Spindle Speed Synchronization” to synchronize speed
and direction only. Using G46.1 does not guarantee a consistent positional
offset between the two spindles. During a G46.1, the follower spindle
attempts to synchronize speeds with the controlling spindle. Once
synchronization is achieved, the current spindle speed and mode (M03,
M04, M05, or M19) programmed for the follower spindle is replaced by
the current controlling spindle speed and mode programmed. The original
follower spindle speed and direction is not retained.
Important: Changes that occur as a result of CSS or other programmed
changes to spindle speeds, directions, and spindle speed override will not
occur until synchronization is achieved.
The format for the G46.1 cycle is as follows:
G46.1;
Important: No other program letters are allowed in the G46.1 block
except auxiliary letters and system installer M--codes.
Deactivate Spindle Synchronization (G45)
Use G45 to deactivate the synchronized spindle feature. When
synchronization is deactivated, the follower spindle will remain in the
same state (M03, M04, M05, or M19) and at the last programmed speed
for controlling spindle until you change the program settings or if your
system installer writes PAL to recommand the spindle.
In a multiprocess system, if the spindles are synchronized, and an
end--of--program (M02) is reached on the process synchronizing the
spindles, both spindles will obey the end--of--program commands. Then
synchronization will be disabled.
The format for the G45 cycle is as follows:
G45;
Important: No other program letters are allowed in the G45 block except
auxiliary letters and system installer M--codes.