Question

22.pny- Pholos See all photosAdd to a creation Edit & Create Share / 2. A single square-thread power screw has an input power of 5 kW at a speed of 2 rev/s. The screw has a diameter of 40 mm and a pitch of 8 mm. The frictional coefficients are 0.14 for the threads and 0.09 for the collar, with a collar friction radius of 50 mm. Find the axial resisting load F and the combined efficiency of the screw and collar. Type here to search 1p e é i@ ??0 w? AA ^ ???dx 35502018 ?

Answer 1

D_ m = 40-4 = 36m , l = p= 8mm, N= 2 rev/s we know torque T = 36F/2 [8 +pi (0.14)(36)/ pi (30)- 0.14 (8)] + 0.09 (100)F/2 = (3.831 + 4.5)F T = 8.33 F N. m (1) (f in KN) angular speed w = 2 pi N = 2 pi times 2 = 4 pi rad/s power p = TW T= p/w= 5000/ 2 pi = 795.77 N.M from (1) F = T/ 8.33 = r 5.53KN efficiency e = F l/ 2 pi T = 95.53 times 8 times 10 ^3 times 10^-3/ 2 pi (795.77) = 0.1528 therefore n = 15.285 % please rate it