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Pulley Friction and HP Brake Calculator

Pulley Friction Brake Equations and Calculator

In Fig. 1 a pulley revolves under the band and in the direction of the arrow, exerting a pull of T on the spring. The friction of the band on the rim of the pulley is (T - w), where w is the weight attached to one end of the band. Let the pulley make N r/min; then the work done per minute against friction by the rim of the pulley is 2πRN(T - w), and the horsepower absorbed by brake = 2πRN(T 2 w)/33,000.

Figure 1 Pulley revolving under the band
Source:

Marks Standard Handbook for Mechanical Engineers

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