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2. The automobile jack shown below is controlled by a screw AB that is single-threaded at A and has a thrust bearing at B (neglect the bearing friction at B). The diameter of the screw is 0.375 in...
The position of the automobile jack shown is controlled by a screw ABC that is single threaded at each end (right-handed thread at A, left-handed thread at C). Each thread has a pitch of 2.5 mm and a mean diameter of 10 mm. If the coefficient of static friction is 0.15, determine the magnitude of the couple M that must be applied to raise the automobile. 3500 N D С М А 30° В 30° E
1. A single-threaded ACME power screw has a major diameter d=1.25 in with a pitch of 0.2 in. The threaded coefficient of friction u is 0.2, and the coefficient of collar friction He is 0.15. The mean collar diameter de is 2 in. The external load on the screw is 1200 lb. Find: a) The torque required to raise the load. b) The maximum nominal shear stress of the screw body.
4. A single-start, square-threaded power screw has the following baseline character- istics: Outside diameter pitch, p Load, W 25.4 mm 5.08 mm 1500 N thread friction coefficient 0.08 collar friction coefficient collar diameter 0.04 28 mm (a) What torque, TR, total, is required to raise the load? Include units. (b) What torque, TL, total, is required to lower the load? Include units (c) Suppose the screw runs at 100 rpm for ten seconds, raising the load. How much energy is...