A vertical power screw with double start square threads of 50 mm mean diameter and 11mm pitch is raised against a load of 10 kN by means of a hand wheel, the boss of which is threaded to act as a nut. A thrust collar, taking up the axial load,supports the wheel boss and has a mean diameter of 60mm. The coefficient of friction is 0.18for the screw and 0.16for the collar. If the tangential force applied by each hand to the wheel is 200 N, find suitable diameter of the hand wheel.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A vertical power screw with double start square threads of 50 mm mean diameter and 11mm pitch is raised against a load of 10 kN by means of a hand wheel, the boss of which is threaded to act as a nut. A thrust collar, taking up the axial load,supports the wheel boss and has a mean diameter of 60mm. The coefficient of friction is 0.18for the screw and 0.16for the collar. If the tangential force applied by each hand to the wheel is 200 N, find suitable diameter of the hand wheel.

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