
B-65272EN/04 FANUC AC SPINDLE MOTOR αiT SERIES 9.NOTES ON MOTOR INSTALLATION
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9.2 CENTERING USING CENTERING PLATES
When connecting the spindle with the motor shaft, make centering
with a target concentricity of 5µm. If centering accuracy measurement
is difficult, it is recommended to use centering plates between the
spindle head and motor.
Prepare two centering plates: one for the motor and the other for the
spindle head. Mate the socket and spigot joint of the plate for the
motor with the socket and spigot joint of the plate for the spindle head
(with a target of no gap). After centering of the plate for the motor
with the motor, center the plate for the spindle head with the spindle
head. Then, attach the motor with the plate to the plate for the spindle
head. (For plate centering, the user should prepare a stand and orient
the spindle upward.)
This centering structure allows high-precision installation even in the case of motor replacement in the field.
Spring pin
To be produced for mating (with
a target of no gap)
Center the spindle with the
plate, then drive pins.
Center the motor with the
plate, then drive pins.
To be produced with
a gap of 30 to 40
µ
m
Spring pin
Stand