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Flat Collars And Bearings

A shaft has a number of a collars integral with it. The external diameter of

the collars is 400 mm and the shaft diemater is 250 mm. If the intensity of pressure is 0.35 N/mm2

(uniform) and the coefficient of friction is 0.05, estimate : 1. power absorbed when the shaft runs at

105 r.p.m. carrying a load of 150 kN ; and 2. number of collars required.

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