Lead Screw Critical Speed

Critical speed is the rotational speed of the lead screw at which the first harmonic of resonance is reached due to the deflection of the lead screw. A system will vibrate and become unstable at these speeds. Several variables affect how quickly the lead screw system will reach critical speed:

  1. The lead of the lead screw

  2. The rotational speed

  3. End fixity

  4. Thrust load

  5. Diameter of the lead screw

  6. Tension or compression loading

For example, the following chart shows that for a lead screw with a 3/4 inch diameter and 70 inch length, the threshold for critical speed is 700 RPM.

lead-screw-critical-speed.png

For more information about lead screw critical speed or to discuss your needs for your specific application, please contact our team.