A band and block brake having 10 blocks, each of which subtends an angle of 14o at center, is applied to drum of effective diameter of 1 m. The brake drum and winding drum of crane mounted on the same shaft weighs 20 kN and have combined radius of gyration of 300 mm. The two ends of the band are attached to the pin on opposite side of the fulcrum. If an effort of 300 N is applied at distance of 800 mm from the fulcrum, find (i) Braking torque, (ii) the angular retardation of the brake, (iii) the time taken by the system to come to rest from the rated speed of 400 rpm. Take coefficient of friction between the drum and the block as 0.25.

A band and block brake having 10 blocks, each of which subtends an angle of 14o at center, is applied to drum of effective diameter of 1 m. The brake drum and winding drum of crane mounted on the same shaft weighs 20 kN and have combined radius of gyration of 300 mm. The two ends of the band are attached to the pin on opposite side of the fulcrum. If an effort of 300 N is applied at distance of 800 mm from the fulcrum, find (i) Braking torque, (ii) the angular retardation of the brake, (iii) the time taken by the system to come to rest from the rated speed of 400 rpm. Take coefficient of friction between the drum and the block as 0.25.

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter9: Moments And Products Of Inertia Of Areas

Section: Chapter Questions

Problem 9.22P

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