Rockwell Automation MPL-xxxx Low-inertia Servo Motors 75 mm or Smaller - Manual (Page 18)

18 MP-Series Low-inertia Brushless Servo Motors with 75 mm or Smaller Frame Sizes
Rockwell Automation Publication MP-IN006C-EN-P - January 2014
Remove and Install a Shaft Key
Shaft keys are constructed of steel. The specified tolerance provides an interference fit (slightly
larger than the opening) for a secure and rigid connection.
To remove a shaft key, perform one of these actions:
•
Lift the key by grasping it with a pliers or similar tool.
•
Lever the key with a screwdriver inserted between the key and the slot.
To install a shaft key, follow these steps.
1. Verify the replacement key matches the keyway in the shaft and the mating mechanical
connection (for example, a coupling or pulley) before proceeding.
2. Align the front of the key with the front of the motor shaft.
This prevents the radiused end-of-cut at the motor end of the keyway from interfering
with correct seating of the key.
3. Support the underside of the shaft diameter with a fixture, and use a controlled press
device to apply a constant force across the top surface to press the key into the shaft.
Shaft Key Installation
ATTENTION: Do not strike the motor’s shaft, couplings, or pulleys with tools during installation or removal of the
shaft key.
Damage can occur to the motor bearings and the feedback device if a sharp impact is applied to the shaft during
installation of couplings and pulleys, or to remove the shaft key, or if leverage is applied from the motor mounting
face to remove devices mounted on the motor shaft.
Apply a constant pressure, with a wheel puller, to the user end of the shaft to remove a friction fit or stuck device.
Key Alignment
Radiused Cut for
Keyway
Key
Shaft
Support for Motor Support for Motor