2.SPINDLE MOTOR MAINTENANCE MOTOR MAINTENANCE B-65285EN/03
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2.1 PREVENTIVE MAINTENANCE
To maintain the original performance and reliability of the spindle
motor for a long time, it is necessary to inspect them as described
(1) Visual inspection
Be careful not to be struck by electric shocks or
caught in gears or other mechanisms during
inspection. When taking corrective actions, keep the
entire machine switched off.
Inspection item Symptom Action
Noise or abnormal
There is unusual noise
acceleration of the
motor exceeds 0.5 G at
the maximum speed.
Check the following and take necessary actions:
• Base and installation
• Centering accuracy of directly coupled section
• Abnormal sound from motor shaft bearings (See "Motor shaft bearing"
• Vibration of or noise from the reducer or belts
• Amplifier failure
• Fan motor failure (See "Fan motor" below.)
Cooling air path
The cooling air path is
clogged with dust.
Clean the stator vents and fan motor on a regular basis.
Cutting fluid on the
• Clean the motor surface.
• If the motor is splashed excessively with coolant, place a cover or take a
If the fan motor can be rotated by the
Replace the fan motor.
If the fan motor cannot be rotated by the
Remove foreign materials, if
any. Adjust its mounting position
by loosening the bolts and
tightening them again.
If unusual noise still remains,
replace the fan motor.
Remove foreign materials, if any. Adjust its mounting position by loosening
the bolts and tightening them again.
If unusual noise still remains, replace the fan motor.
Unusual sound from
the motor shaft bearing
Replace the shaft bearing, and check the shaft for centering accuracy. Also
check on the radial load. Before replacing the shaft bearing, contact your
FANUC service staff.
Cutting fluid in the
Check the terminal box lid and conduit packing.
If there is lot of fluid on the terminal box surface, protect the terminal box by
installing a shelter over it.
of the terminal box
Loosen screw in the
• Tighten the screw.
• Check whether there is abnormal vibration during motor rotation.