Pulley RPMs

The Pulley RPMs calculator computes the RPMs of a pulley based on the belt speed (bS) and diameter (D) of the pulley.Belt

INSTRUCTIONS: Choose units and enter the following:

• (bS) Belt Speed (Linear speed of the belt)
• (D) Pulley Diameter

Pulley RPMs: The calculator return the rotation rate in revolutions per minute. However this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

The formula for belt pulley RPMs is

   RPM  = bS / (π • D) 

where:

• RPM is the belt pulley rotation rate 
• bS is the belt speed
• D is the diameter of the pulley

Simple Machine Calculators

• Lever Beam Length:  Computes the length of a lever (beam) on one side of a fulcrum needed to lift an object based on the objects weight and the length of the beam on the other side of the fulcrum.
• Leverage Lift Weight:  Computes the weight that can be lifted using a lever based on the downward force and the length of the lever on either side of the fulcrum.
• Fulcrum Position (x): Computes the position of the fulcrum needed in a lever to lift a weight (W) with a downward force (F) with a beam of length (L), where L = x + y.
• Belt Length:  Computes the length of a belt that goes around two pulleys of different diameters separated by a specific distance.two pulley system
• Belt Speed: Computes the speed a belt travels based on the diameter of the pulley and the RPMs.
• Pulley RPMs: Computes the RPMs of a pulley based on the speed of the belt and the diameter of the pulley.
• 2nd Pulley RPMs: Computes the RPMs of a second pulley in a two pulley system when the RPM and Diameter are known for one pulley and the diameter of the second pulley is also known.
• 2nd Pulley Diameter:- Computes the diameter of a second pulley in a two pulley system based on diameter and RPM of one pulley and the RPMs of the second.
• RPM of 4th pulley on three shafts: Computes the RPMs of a fourth pulley on a three shaft system when the RMPs of the first shaft is known and the four diameters.
• 2nd Gear RPM:  Computes the RPMs of a second gear when the RPM and number of teeth are known for the first gear, and the number of teeth are known for the second gear.
• Pulley RPMs: Computes pulley RPMs from belt speed and pulley diameter.
• Sum of Two Lengths: Computes the sum of two lengths (useful with lever calculations).
• Second Gear Torque: Calculates the torque of a second gear when the torque and number of teeth are known for the first gear and the number of teeth of the second gear is known.
• Leadscrew Torque (lift): Computes the torque required to lift a load with a square thread power screw assembly.