Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 426)

Spindles
Chapter 17
17-28
When synchronization is active, any part program commands
destined for the follower spindle (i.e., M03, M03.2,
M03.3...G12.1, G12.2, and G12.3) will cause an error. On a
multiprocess configuration, this is true of either process.
On a multiprocess 9/Series, the process controlling the controlling
spindle also controls the follower spindle when spindle
synchronization is active. If it is unable to obtain control, an error
results: UNABLE TO SYNCH IN CURRENT MODE.
Important: Typically, the programmed speed of the controlling spindle
dictates the speed of the follower spindle. In the event that the
programmed speed exceeds the maximum or drops below the minimum
allowable values for the synchronized pair, the spindle speed will be
restricted to those allowable values, as shown on page 17-28.
the example below shows what will happen when:
no overlap occurs between the controlling and follower
spindles’gear ranges
the controlling spindle has a higher gear range than the
follower spindle
the controlling spindle has a lower gear range than the
follower spindle
Example 17.6
Valid Gear Ranges for Synchronized Spindles
Controlling Spindle
Gear Range
(RPM)
Follower Spindle
Gear Range
(RPM)
Requested
Spindle Speed
(RPM)
Valid Programmed
Spindle Speeds
(RPM)
Spindles will
Synchronize at
(RPM):
1000 to 3000 100 to 300 1500 None N/A
1000 to 3000 800 to 1500 1800 1000 to 1500 1500
1000 to 3000 1800 to 3200 1500 1800 to 3000 1800
in a multiprocess system, if the spindles are synchronized, and an
end--of--program is reached on the process synchronizing the
spindles, both spindles will obey the end--of--program commands
and synchronization is disabled.
END OF CHAPTER