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Design and Theory

Screw Maximum RPM

Every lead screw, or any shaft, has a rotational speed at which there is a point of excessive vibration/harmonics.
The screws resistance is a function of:
  • Screw length
  • Screw diameter
  • Type of mounting (end fixity)
This speed is known as the critical speed for the screw.  Exceeding this value may result in excessive vibration. For optimal performance, it is recommended to operate below 80% of the screw critical speed.

The screw shaft can vibrate at high RPM

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