Rockwell Automation 8520-ARM2 9/Series CNC AMP Reference Manual Documentation Set - Manual (Page 214)

Servo Parameters
Chapter 7
7-68
Function
Use this parameter and the parameter Teeth on Lead Screw for Velocity
FB to tell the control the gear ratio between the motor and velocity
feedback device. Typically the velocity feedback device is motor mounted.
Regardless of where the velocity feedback is mounted, use this parameter
in conjunction with Teeth on Lead Screw for Velocity Feedback to identify
the number of feedback device rotations that occur per revolution of the
ball screw. If the same feedback device is used for position feedback the
value entered here must be the same as the value entered for “Teeth on
Motor Gear for Position Feedback”.
In some cases, there may be a series of gears or gearbelt pulleys that make up a
final gear ratio for velocity feedback. In this case, it is necessary to factor this
gear ratio into this parameter and the parameter Teeth on Lead Screw for Vel
FB.
Figure 7.32
Mechanical Considerations for Teeth and Pitch Parameters
Axis
Lead screw
thread pitch
Teeth on
lead screw gear
Teeth on
motor gear
Servo
motor
Encoder for
Velocity Feedback
Axis Parameter Number Axis Parameter Number
(1) [1013] (7) [7013]
(2) [2013] (8) [8013]
(3) [3013] (9) [9013]
(4) [4013] (10) [10013]
(5) [5013] (11) [11013]
(6) [6013] (12) [12013]
7.3.5
Teeth on Motor Gear for
Velocity Feedback