Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 252)

Servo Parameters
Chapter 7
7-106
Function
This parameter is used only for 9/440 or 1394 drives configured to use one
of their axis modules as a spindle drive. See page 7-100 for details.
Use the parameters No of Teeth on Motor Gear and No of Teeth on
Spindle Shaft to identify the gear ratio between the motor shaft and the
final spindle output. If the motor is directly connected in a one to one ratio
with the spindle shaft you must still identify the ratio by entering one for
both of these parameters. The ratio established by these parameters is used
for spindle speed calculations by the control and to identify the ratio
between velocity feedback and spindle position feedback for spindles with
two feedback devices.
In some cases, there may be a series of gears or gearbelt pulleys that make up a
final gear ratio for a spindle. In this case, it is necessary to calculate this gear
ratio so that this parameter and the parameter No of Teeth on Motor Gear
result in the desired ratio.
Axis Parameter
Number
Axis Parameter
Number
(1) [1018] (9) [9018]
(2) [2018] (10) [10018]
(3) [3018] (11) [11018]
(4) [4018] (12) [12018]
(5) [5018] (13) [13018]
(6) [6018] (14) [14018]
(7) [7018] (15) [15018]
(8) [8018]
Range
1 to 32767
Notes
This parameter must be set independently for each 1394 spindle.
Important: For two device feedback 1394 drives as a spindle
configurations, the 2nd feedback device used for closure of the position
loop must be a 1:1 ratio. This parameter in that case would be used to
define the gear ratio between motor shaft and final spindle output for the
velocity loop.
7.5.4
No of Teeth on Spindle Shaft