Pulley Diameters and Speeds

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Speed of driving pulley versus speed of driven pulley can be expressed as

d₁ n₁= d₂ n₂          (1)

where

d₁ = driving pulley diameter (inch, mm)

n₁ = speed of driving pulley (rpm - rounds per minute)

d₂ = driven pulley diameter (inch, mm)

n₂ = speed of driven pulley (rpm - rounds per minute)

Equation (1) can be transformed to express the

Speed of Driven Pulley 

n₂ = d₁ n₁ / d₂    (2)

Speed of Driver Pulley 

n₁ = d₂ n₂ / d₁    (3)

Diameter of Driven Pulley 

d₂ = d₁ n₁ / n₂    (4)

Diameter of Driver Pulley 

d₁ = d₂ n₂ / n₁    (5)

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Related Topics

• Mechanics - Kinematics, forces, vectors, motion, momentum, energy and the dynamics of objects

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