Ball Screw RCA: Breakage of Shaft End


Damage Condition

Shaft end (mainly bearing journal) broke completely.

Possible Causes

  • 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

Breakage of Shaft End

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


Source: NSK