Q1. A screw jack with a 1-in. double-thread Acme screw is used to raise a load of 4000 N. A plain thrust collar of 50-mm mean diameter is used. Coefficients of running friction are estimated as 0.12 and 0.09 for f and fc, respectively. (a) Determine the screw pitch, lead, thread depth, mean pitch diameter, and helix angle. (b) Estimate the starting torque for raising and for lowering the load. (c) Estimate the efficiency of the jack when raising the load.

Q1. A screw jack with a 1-in. double-thread Acme screw is used to raise a load of 4000 N. A plain thrust collar of 50-mm mean diameter is used. Coefficients of running friction are estimated as 0.12 and 0.09 for f and fc, respectively. (a) Determine the screw pitch, lead, thread depth, mean pitch diameter, and helix angle. (b) Estimate the starting torque for raising and for lowering the load. (c) Estimate the efficiency of the jack when raising the load.

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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Concept explainers

Metrology of Screw Threads

Screw threads are a series of ridges having the profile of a helix. This helix profile runs continuously along the length of a uniform solid or a hollow bar of a circular cross-section at periodic intervals. These helix ridges are also formed over a conical bar. These continuous helical ridges are termed threads.

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Step 1: Screw pitch, lead, thread depth, mean pitch diameter and helix angle calculation

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Step 2: Calculation of Torque for raising load

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Step 3: Torque for lowering load

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Step 4: efficiency of jack when raising load

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