
9.NOTES ON MOTOR INSTALLATION FANUC AC SPINDLE MOTOR αiT SERIES B-65272EN/04
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* Before attaching a coolant joint, apply screw locking
adhesive. Be sure to use a motor shaft tip screw when
attaching a coolant joint.
<3> Method of calculating a thrust load imposed on the motor when a
coolant pressure of 70 kgf/cm
2
is applied
(Example)
When the pressure reception diameter (d) of a coolant joint
is φ12 and rotation joint is Deublin.
The pressure reception areas are calculated as follows:
Position A : 1.13cm
2
(φ12)-0.28cm
2
(φ6)=0.85cm
2
Position B : 1.31cm
2
(φ12.9)-0.28cm
2
(φ6)=1.03cm
2
So, the thrust load imposed on position A is 59.5 kgf, and
the thrust load imposed on position B is 72.1 kgf.
Accordingly, the thrust load 12.6 kgf (72.1 kgf - 59.5 kgf)
acts in the direction for pushing the motor shaft forward.
When pressure reception diameter d = φ12.5, a similar
calculation can be made to find a thrust load of 5.6 kgf.
Thrust load
Coolant joint
Pressure reception diameter φd
φ
d