January 2026
Intermediate
900 pages
23h 23m
English
Content preview from Machine Design, 2nd Edition by Pearson
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CASE V: DESIGN OF A HIGH-SPEED HOIST
Aim: To design sheave ropes and supports for the balancing weight of a high-speed hoist. In this case study, we will use the following set of data.
Weight of unloaded cage = 10 kN
Weight of balancing ropes is 8 per cent of weight of cage.
Speed: Rest to 30 km/hour during a travel of 5 m.
Sheave: Carried on two steel joists of same section supported over a span of 3 m, 1 m from each support.
Two joists are placed at centre distance of 250 mm. Housings for the bearings are connected to the joists. The balancing weights for the unloaded cage are carried by two wire ropes passing over the sheave and attached to the cage. Balancing weights run in the guides attached to the wall of the lift shaft. Fig. 1 shows ...
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