Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 443)

Spindles
Chapter 17
17-7
Use these three G--codes to manipulate the spindle synchronization feature:
Set spindle positional synchronization (G46)— sets the follower spindle
speed/direction and relative position offset to match the controlling
spindle.
Set active spindle speed synchronization (G46.1)— sets the follower
spindle speed/direction to match the controlling spindle.
Deactive spindle synchronization (G45)— shuts off synchronization
while maintaining the controlling and follower spindles’current speed
and direction.
Activate Spindle Positional Synchronization (G46)
Use the “Activate Spindle Positional Synchronization” to synchronize
speed and position. The position is based on a programmed S--word
(degrees). If you do not program an S--word in the G46 block, it will
automatically go to the relative positional offset, set by your system
installer. Refer to your system installer’s documentation for more
information.
During a G46, the spindles attempt to match speeds. Once the speeds are
matched, the spindles attempt to synchronize their relative positional
offset. Once synchronization is achieved, the active spindle speed and
mode (M03, M04, M05, or M19) programmed for the follower spindle is
replaced by the current controlling spindle speed and mode.
Important: Changes in spindle speeds that would normally 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 block is as follows:
G46S__;
Where: Defines:
S the angular offset between two spindles (degrees)*
*The range for the S--word is 0 to 360. Your system installer defines where 0_ is for each
spindle. The value defined as the offset value is absolute and independent of spindle direction.
Important: No other program letters are allowed in the G46 block except
auxiliary letters and system installer M--codes.
17.4.1
Using the Spindle
Synchronization Feature