Find the power required to drive a d = 1.5-ich power screw having double square threads with a pitch of p= ¼ in. The nut is to move at a velocity of 2 in/sec and move a load of F= 2.2 kips. The frictional coefficients are f = 0.10 for the threads and f. = 0.15 for the collar. The frictional diameter of the collar is d.= 2.25 in.

Fig: 1