Answered: jack screw

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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(5) A 2½-in square thread steel screw is used in a common jack screw. There are 2¼TPI. The body of the jack is made of cast iron. The coefficient of friction on the threads is 0.15. The thrust collar at the top has an inside diameter of 1½-in & the outside diameter of 3.0in. The coefficient for the collar is 0.25. The load to be lifted by the jack screw is 2 tons. Determine: (a) the efficiency of the screw only; (b) the efficiency of the screw & the thrust collar; (c) the pull necessary @ the end of a 2.0ft lever to operate this screw jack.

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