(5) A 2½-in square thread steel screw is used in a common jack screw. There are 214TPI. 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 1/2-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.

(5) A 2½-in square thread steel screw is used in a common jack screw. There are 214TPI. 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 1/2-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.

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.
4.) A flat belt makes contact with an 16 in. diameter pulley through half its circumference. If the coefficient of friction is 0.45 , and a torque of300ft−bsis to be transmitted, calculate the belt tensions. (please type answer not write by hend)
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A double square thread power screw has a pitch of 6 mm and mean radius of 34 mm. If it is used to lift a load 50 kN and coefficient of friction of threads is 0.15, determine the torque required to turn the screw.
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