A square thread jackscrew has a 2 threads per inch. It is to lift 15 tons. The friction radius of the collar is 1 in. The coefficient of friction between the threads of the screw and base is 0.15, that between the screw and the collar is 0.13. Determine: a. The diameter of the root of the screw if the allowable stress in compression is 6 000 psi. b. The torque required to turn the screw. c. The pull required at the end of a 5 ft bar raises the load.
A square thread jackscrew has a 2 threads per inch. It is to lift 15 tons. The friction radius of the collar is 1 in. The coefficient of friction between the threads of the screw and base is 0.15, that between the screw and the collar is 0.13. Determine: a. The diameter of the root of the screw if the allowable stress in compression is 6 000 psi. b. The torque required to turn the screw. c. The pull required at the end of a 5 ft bar raises the load.
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
A square thread jackscrew has a 2 threads per inch. It is to lift 15
tons. The friction radius of the collar is 1 in. The coefficient of
friction between the threads of the screw and base is 0.15, that
between the screw and the collar is 0.13. Determine:
a. The diameter of the root of the screw if the
allowable stress in compression is 6 000 psi.
b. The torque required to turn the screw.
c. The pull required at the end of a 5 ft bar raises the
load.
d. The twisting moment exerted at the root of the
threads.
e. The power output of the screw if it is turning at 60
rpm.
f. The power input of the screw.
g. The efficiency of the screw and collar
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