An ACME thread power screw has an efficiency of 70%. Determine the ratio of the lead to its mean diameter if the coefficient of friction of threads is 0.08 while the collar friction is found to be negligible.

An ACME thread power screw has an efficiency of 70%. Determine the ratio of the lead to its mean diameter if the coefficient of friction of threads is 0.08 while the collar friction is found to be negligible.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter6: Fasteners

Section: Chapter Questions

Problem 12RQ

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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.

Question

12. An ACME thread power screw has an efficiency of 70%. Determine the ratio of the lead to its mean diameter if the coefficient of friction of threads is 0.08 while the collar friction is found to be negligible.

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