Unit 4 numericals on power screws 2

The document provides numerical examples for calculating values related to power screws. In the first example, the document calculates (1) the force required at the hand wheel to drive a screw, (2) the efficiency of a shaft straightener, and (3) the bearing pressure on threads in a nut for a given screw configuration and applied load. In the second example, the document calculates (1) the power required to drive a lead screw for a lathe and (2) the efficiency of the screw, given parameters like screw diameter, pitch, applied load, and rotational speed.