Problem 16–9 is preliminary to analyzing the brake. A rigid molded non-asbestos lining is used dry in the brake of Problem 16–9 on a cast-iron drum. The shoes are 6 in wide and subtend a 90° arc. Conservatively estimate the maximum allowable actuation force and the braking torque.
Problem 16–9
The shoes on the brake depicted in the figure subtend a 90° arc on the drum of this external pivoted-shoe brake. The actuation force P is applied to the lever. The rotation direction of the drum is counterclockwise, and the coefficient of friction is 0.30.
(a) What should the dimension e be, in order to eliminate frictional moments on each shoe?
(b) Draw the free-body diagrams of the handle lever and both shoe levers, with forces expressed in terms of the actuation force P.
(c) Does the direction of rotation of the drum affect the braking torque?
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