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1 Installation
MITSUBISHI CNC
(2) Direct coupling - Rigid coupling
A rigid coupling has benefits such as high rigidity, and relatively lower price. However, shaft core
deviation and angle deviation of the motor shaft and ball screw are not allowed, so full attention is
required in installing the rigid coupling. Shaft core deviation is desired to be 0.01mm or less. If enough
accuracy cannot be ensured, the motor will have a broken shaft, or the bearing will have a shorter life.
In addition, note that a rigid coupling is not acceptable for HF-KP Series servo motors.
Also note that the motor side ball screw bearing must be locked so that to avoid the thrust load on the
motor shaft due to expansion and contraction of the ball screw.
(3) Gear connection
Gear's accuracy and backlash amount
greatly affect on the machine's positioning
accuracy and noise during operation.
Thus, according to the machine's
specification, appropriately select the
accuracy and backlash amount.
In gear connection, it is required to take
measures against oil to enter the motor.
Load side
Coupling
Motor side
0.01mm or less
Load side
Motor side
Example of gear connection with load