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A power screw having single start square threads of 25 mm. nominal diameter and 5 mm pitch is acted upon by an axial load of 10 kN. The outer and inner diameters of screw collar are 50 mm and 20 mm respectively. The coefficient of thread friction and collar friction may be assumed as 0.2 and 0.15 respectively. The allowable thread bearing pressure is 5.8 N/mm², find: 1. The torque required to rotate the screw during raising and lowering the load. 2. The maximum shear stress in the screw. 3. The number of threads of nut in engagement with the screw.

A power screw having single start square threads of 25 mm. nominal diameter and 5 mm pitch is acted upon by an axial load of 10 kN. The outer and inner diameters of screw collar are 50 mm and 20 mm respectively. The coefficient of thread friction and collar friction may be assumed as 0.2 and 0.15 respectively. The allowable thread bearing pressure is 5.8 N/mm², find: 1. The torque required to rotate the screw during raising and lowering the load. 2. The maximum shear stress in the screw. 3. The number of threads of nut in engagement with the screw.

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
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A power screw having single start square threads of 25 mm nominal diameter and 5 mm pitch is acted upon by an axial load of 10 kN. The outer and inner diameters of screw collar are 50 mm and 20 mm respectively. The coefficient of thread friction and collar friction may be assumed as 0.2 and 0.15 respectively. The allowable thread bearing pressure is 5.8 N/mm², find: 1. The torque required to rotate the screw during raising and lowering the load. 2. The maximum shear stress in the screw. 3. The number of threads of nut in engagement with the screw.
Transcribed Image Text:A power screw having single start square threads of 25 mm nominal diameter and 5 mm pitch is acted upon by an axial load of 10 kN. The outer and inner diameters of screw collar are 50 mm and 20 mm respectively. The coefficient of thread friction and collar friction may be assumed as 0.2 and 0.15 respectively. The allowable thread bearing pressure is 5.8 N/mm², find: 1. The torque required to rotate the screw during raising and lowering the load. 2. The maximum shear stress in the screw. 3. The number of threads of nut in engagement with the screw.
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