(b) Figure 1.1 shows a 40 mm diameter power screw jack having double-square thread with a pitch of 6 mm. A verticle axia

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B Figure 1 1 Shows A 40 Mm Diameter Power Screw Jack Having Double Square Thread With A Pitch Of 6 Mm A Verticle Axia 1 (66.04 KiB) Viewed 47 times

(b) Figure 1.1 shows a 40 mm diameter power screw jack having double-square thread with a pitch of 6 mm. A verticle axial load can reach a maximum of 10 kN on the screw. The coefficients of frictions are 0.10 for the thread and 0.15 for the collar. The load is raised at a velocity of 48 mm/s. Given that the fricional diameter of the collar is 60 mm, determine the following. Torque needed to raise the load. i. 11. iii. Torque needed to lower the load. (5 marks) (5 marks) The overall efficiency of the power screw during lifting and lowering the load. F = 10 kN Figure 1.1 A power screw jack (5 marks)