2nd Pulley RPM

The 2nd Pulley RPM calculator computes the RPMs of a second pulley based on the the RPMs and Diameter of the first pulley and the diameter of the second pulley.

INSTRUCTIONS: Choose units and enter the following:

• (RPM₁) RPMs of First Pulley
• (D₁) Diameter of First Pulley
• (D2) Diameter of Second Pulley

2nd Pulley RPMs (RPM₂): The calculator returns the rotational velocity of the second pulley in revolutions per minute (RPMs).  However, this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

The rotation rate of the two pulleys are interconnected by the fact of a belt or chain running on the perimeter of the two pulleys.  This means that the rotation rate of pulley 1 and its diameter will dictate the belt speed.  Based on the belt speed and the diameter of the second pulley, you can compute the rotation rate of the second pulley.  The formula for the 2nd pulley rotation rate is:

RPM₂ = (D₁/D₂)⋅RPM₁

where:

• RPM₂ = Rotation rate of second pulley
• D₂ = Diameter of second pulley
• RPM₁ = Rotation rate of first pulley
• D₁ = Diameter of first 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.

Spanish Versions (Otras Calculadoras)

• Circular Motion - Esta calculadora usa las ecuaciónes para el movimiento circular. 
• La Longitud de la Correa - Esta calculadora computa la longitud de la correa alrededor de los dos poleas. 
• La Velocidad de la Correa - Esta calculadora computa la velocidad de la correa basarse en el diámetro y los RPMs.
• Segundo Polea (RPM) - Esta calculadora computa los revoluciónes por minuto o RPMs del segundo polea basarse en los RPMs y el diámetro del primero polea y el diámetro del segundo polea. 
• Polea Para Correa (RPM) - Esta calculadora computa los revoluciónes por minuto o RPMs de la polea basarse en el diámetro y la velocidad de la correa.