Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 442)

Spindles
Chapter 17
17-6
Use this feature to synchronize the position and/or velocity between two
spindles with feedback using your 9/440, 9/260, or 9/290 control.
Two types of synchronization are available:
Velocity — synchronizes the speed between two spindles only
Velocity and Position — synchronizes the speed and angular
position between two spindles
Prior to activation, you are responsible for selecting the proper gear ranges
and ratios. The gear ratio between the feedback device and the spindle
must be 1:1. Any other type, including nonunit ratios, will not allow
repeatability of the orientation of your spindle and may cause positioning
offset inaccuracies.
Spindle Configuration
Your system installer selects two spindles to make up the synchronization
pair, which consists of the controlling and follower spindles. During
synchronization, the controlling spindle initiates spindle motion while the
follower spindle synchronizes with it. Your system installer determines the
configuration of these spindles. Refer to your system installer’s
documentation for more information about spindle configuration.
Gear ranges are set separately for each spindle. If the controlling spindle
speed is outside of the current follower spindle gear range when a seek is
attempted, the controlling spindle will ramp to within the follower’s limits
set in AMP.
Selecting the Controlling Spindle
The synchronized spindle’s controlling spindle, which is determined by
your system installer, must be programmed as the part program’s
controlling spindle in your part program prior to synchronization. Use one
of the G12 codes (G12.1, G12.2, and G12.3) to designate the active
controlling spindle for spindle synchronization. Refer to page 17-1 for
more information about the G12 codes and your system installer’s
documentation to identify your controlling spindle.
Important: Typically, the programmed speed of the controlling spindle
dictates the speed of the follower spindle. For more information about
valid gear ranges, refer to page 17-11.
17.4
Synchronized Spindles