Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 21 Nov 2017 My Price 5.00

double-threaded Acme

A double-threaded Acme stub screw of 2-in. major diameter is used in a jack having a plain thrust collar of 2.75-in. mean diameter. Coefficients of running friction are estimated as 0.10 for the collar and 0.11 for the screw.

 

(a) Determine the pitch, lead, thread depth, mean pitch diameter, and helix angle of the screw.

(b) Estimate the starting torque for raising and for lowering a 3500-lb load.

(c) If the screw is lifting a 3500-lb load at the rate of 4 ft/min, what is the screw rpm? What is the efficiency of the jack under this steady-state condition?

(d) Would the screw overhaul if a ball thrust bearing (of negligible friction) were used in place of the plain thrust collar?

 

Answers

Maurice Tutor
(5)
Status NEW Posted 21 Nov 2017 10:11 PM My Price 5.00

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