Question: 5 B A power screw has double - start square thread of 3 6 mm nominal diameter and 6 mm pitch. The load on the

5B A power screw has double-start square thread of 36 mm nominal diameter and 6 mm pitch. The load on the screw is 8 kN and mean diameter of thrust collar is 40 mm . Assuming the friction coefficient for both screw and collar as 0.15, determine
i. Torque required to raise the load.
ii. Efficiency of the screw
iii. Is the screw self-locking?
5 B A power screw has double - start square

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