Two Pulley Connecting Belt Design and Calculations

Mechanics & Machine Calculations

The following equations will determine: Speed Ration, Arc of contact, Tension ration for belt about to slip, Power Capacity, Pulley Torque, Initial Tension

Symbols Used in Calculations


Pulley Speed Ratio



Two Pulleys Belt


Tension ratio for belt about to slip:

Tension Ratio Belt


Power capacity:

Belt Power Capacity


Pulley Torque

Pulley Torque Equation


Pulley Initial Tension

Pulley Initial Tension


Effect of centrifugal force: the belt tensions are reduced by mv2 so that:

Pulley Centifugal FOrce

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