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11 Cards in this Set
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1.) The band brake of a band has 210 degress of contact with its drum. By laboratory tests, it is found that pull on the tight side is 800 lbs and the pull on the slack side is 285 lb. What is the coefficient of friction? |
f= 0.281 |
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2.) The inertia load on an electric brake is 32 lb-ft² and the drive shaft is rotating at 2000 rpm, What average torque is required to bring this load to a complete stop in 1.2 sec? |
173.61 ft-lbs |
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3.) The band of a band brake has a contact angle of 180°. It is found experimetally that pulls on the bands are 275 kg and 100 kg respectively under certain operating conditions. Find the coefficient of friction/ |
f=0.322 |
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4.) A brake requires 900 in-lb of torque to stop a shaft operating at 840 rpm in a period of 3.5 seconds. What is the inertia load expressed in lb-ft²? |
96.25 ft²-lb |
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Types of brakes |
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block brake formulas Braking torque (3) |
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Formula for brakes A. Torque developed by the braking action B. Actuating force C. Maximum unit pressure D. Maximum allowable stress |
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Formula for differential brake A. Clockwise rotation B. Counter clockwise rotation |
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Formulas for brake shoe A. Heat dissipated in brakes B. For lowering brake, the heat dissipated C. The temperature rise |
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Formula for spot brake A. Braking tor torque capacity |
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formula for horsepower friction wheels |
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