Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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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 coni…
Question
-- A double-threaded power screw with square threads pushes against a load of 3,822 N at a speed of 15 mm/s. The screw has a major diameter of 20 mm and a pitch of 6 mm. The frictional coefficient of the threads is 0.25, and collar friction is negligible. What is the rotational speed of the screw in units of revolutions per minute? Type your answer... 2 points
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Transcribed Image Text:-- A double-threaded power screw with square threads pushes against a load of 3,822 N at a speed of 15 mm/s. The screw has a major diameter of 20 mm and a pitch of 6 mm. The frictional coefficient of the threads is 0.25, and collar friction is negligible. What is the rotational speed of the screw in units of revolutions per minute? Type your answer... 2 points
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Step 1: Calculate the screw mean diameter.
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Step 2: Calculate the lead angle.
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Step 3: Calculate the friction angle.
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Step 4: Calculate the rotational speed of the screw by equating power equations for raising the load.
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