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A vertical two start square threaded screw of a (100 mm) pitch diameter and (20 mm) pitch supports a vertical load of (18 kN). The axial thrust on the screw is taken by a collar bearing of (87.5 mm) mean radius. Find the force required at the end of a lever which is (400 mm) long in order to lift and lower the load. The coefficient of friction for the vertical screw and nut is (0.15) and that for collar bearing is (0.2). Also, find the overall efficiency for the two cases.

A vertical two start square threaded screw of a (100 mm) pitch diameter and (20 mm) pitch supports a vertical load of (18 kN). The axial thrust on the screw is taken by a collar bearing of (87.5 mm) mean radius. Find the force required at the end of a lever which is (400 mm) long in order to lift and lower the load. The coefficient of friction for the vertical screw and nut is (0.15) and that for collar bearing is (0.2). Also, find the overall efficiency for the two cases.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A vertical two start square threaded screw of a (100 mm) pitch diameter and (20 mm) pitch supports a vertical load of (18 kN). The axial thrust on the screw is taken by a collar bearing of (87.5 mm) mean radius. Find the force required at the end of a lever which is (400 mm) long in order to lift and lower the load. The coefficient of friction for the vertical screw and nut is (0.15) and that for collar bearing is (0.2). Also, find the overall efficiency for the two cases.
Transcribed Image Text:A vertical two start square threaded screw of a (100 mm) pitch diameter and (20 mm) pitch supports a vertical load of (18 kN). The axial thrust on the screw is taken by a collar bearing of (87.5 mm) mean radius. Find the force required at the end of a lever which is (400 mm) long in order to lift and lower the load. The coefficient of friction for the vertical screw and nut is (0.15) and that for collar bearing is (0.2). Also, find the overall efficiency for the two cases.
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