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.

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Metrology of Screw Threads

Screw threads are a series of ridges having the profile of a helix. This helix profile runs continuously along the length of a uniform solid or a hollow bar of a circular cross-section at periodic intervals. These helix ridges are also formed over a conical bar. These continuous helical ridges are termed threads.