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A power screw jack similar to the illustration below has a 1 ½ in diameter double thread Acme screw and used to raise and lower a load of 65 kN Take the running friction as

A power screw jack, similar to the illustration below, has a 1 ½ in. diameter, double thread Acme screw
and used to raise and lower a load of 6.5 kN. Take the running friction as f = 0.1 and fc = 0.08 ; and the
collar mean diameter as 50 mm.
a) Determine the screw lead, mean thread diameter, thread depth and the helix angle;
b) Estimate the starting torque for raising and lowering the load;
c) Estimate the efficiency of the jack for raising the load; and
d) Estimate the power required to drive the screw at a constant one revolution per second.

 

Jun 15 2020 View more View Less

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