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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Question
(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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