(2) A single square thread jackscrew has 2.0TPI. It is to lift 15 tons. The friction radius of the collar is 1-in. The coefficient of friction between the threads and screws and base is 0.15, that between the screw and collar is 0.13. Determine: (a) the diameter of the root of the screw if the allowable stress in compression is 6,000psi; (b) the pull required at the end of 5.0ft bar to raise the load; (c) the twisting moment exerted at the root of the threads; (d) the efficiency of the screw and collar.
(2) A single square thread jackscrew has 2.0TPI. It is to lift 15 tons. The friction radius of the collar is 1-in. The coefficient of friction between the threads and screws and base is 0.15, that between the screw and collar is 0.13. Determine: (a) the diameter of the root of the screw if the allowable stress in compression is 6,000psi; (b) the pull required at the end of 5.0ft bar to raise the load; (c) the twisting moment exerted at the root of the threads; (d) the efficiency of the screw and collar.
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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Transcribed Image Text:(2) A single square thread jackscrew has 2.0TPI. It is to lift 15 tons. The friction radius of the collar is
1-in. The coefficient of friction between the threads and screws and base is 0.15, that between the
screw and collar is 0.13. Determine:
(a) the diameter of the root of the screw if the allowable stress in compression is 6,000psi;
(b) the pull required at the end of 5.0ft bar to raise the load;
(c) the twisting moment exerted at the root of the threads;
(d) the efficiency of the screw and collar.
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