A double square threaded power screw has an efficiency of 65% when raising a load. Friction angle for threads is 8.54o, with collar friction negligible. The pitch diameter of the screw is 70 mm. When lowering a load, a uniform speed is maintained by a brake. If the load is 10 tons, what torque must be exerted by the brake? Is this screw self-locking?

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Q: How much torque must be applied to drive the screw with the applied load in units of newton meters?

A: Here,  is lead angle,  is pitch,  is mean thread diameter.

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Clutches, Brakes, Couplings, and Flywheels

The clutch is described as a machine element used to connect or disconnect two shafts together to transmit torque or power. The clutch works on the principles of friction. The clutch is commonly used in automobiles to transfer power from the driving shaft to the driven shaft.