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Design and Theory

Ball screws must be lubricated to meet life requirements

  • Oil or grease is required to prevent premature failure
  • Reducing the coefficient of friction too much actually increases failure potential

Ball screws must be loaded axially

  • Moment loads may decrease life by 90%
  • Radial loads may decrease life by 90%

Ball screw misalignment  is a significant cause of failures

  • Misalignment causes fatigue stress on end journals
  • Misalignment induces a radial or moment load on the ball nut
  • Misalignment can cause binding and increased loads
  • Misalignment can cause vibration and fretting corrosion
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