In the gear-pulling assembly shown, the square-threaded screw AB has a mean radius of 22.5 mm and

Question:

In the gear-pulling assembly shown, the square-threaded screw AB has a mean radius of 22.5 mm and a lead of 6 mm. Knowing that the coefficient of static friction is 0.10, determine the couple which must be applied to the screw in order to produce a force of 4.5 kN on the gear. Neglect friction at end A of the screw.