The mean diameter of the square threaded screw having pitch of 10 mm is 50 mm....

The mean diameter of the square threaded screw having pitch of 10 mm is 50 mm. A load of 20 kN is lifted through a distance of 170 mm. Find the work done in lifting the load and the efficiency of the screw, when
1. The load rotates with the screw, and
2. The load rests on the loose head which does not rotate with the screw.
The external and internal diameter of the bearing surface of the loose head are 60 mm and 10 mm respectively. The coefficient of friction for the screw and the bearing surface may be taken as 0.08.

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samet mamat answered 1 year ago

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