2022-11-15
⦿  Purpose of Ball Screw Pretension

1. Reduce the bending of ball crew due the weight

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2. Compensate the thermal expansion of ball screw

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3. Increasing the rigidity of ball screw

 

⦿ Bearing Damage and Failure Mode about the Pretension Issue

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Failure Reason:
1. Nut is not fastened
                                                                                                       
2. The pretension is not enough
                                                       
3. The temperature raising of the ball screw exceeds expectation


⦿ Case Study

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Countermeasures:
1.
 The precision nut should be fastened

2. The quantity of pretension should be enough
    (Set the gauges on the motor side & supporting side of the ball screw at the same time while measuring the quantity of pretension)
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3. There should be no unusual temperature raising of ball screw

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