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Damage Condition Possible Causes Countermeasures
Shaft end (mainly bearing journal) broke completely.
  • Rotational bending fatigue caused by misalignment of screw shaft (the bearing journal was forced to bend because of eccentricity between the ball screw thread and the bearing journal)
  • Improve assembly accuracy of the ball screw

 

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Breakage of Shaft End

Part: Screw shaft
Symptom: Shaft end broke completely
Cause: Broken bearing journal due to rotating bending fatigue

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