Question

H8-4: For the following diagram, bar AB is pinned to collar B which is unthreaded and rests on collar C. The mean radius of the thread is , 1.5 in and the pitch is p 0.2 in. Between the threads of collar C and the threads of the vertical shaft, μ,-0.22 and μ,-0.25. The suspended object is 300 lb. What couple must be applied to the collar C to rotate it at a constant rate, and to cause the object to move upward? 20 in 20 in

Answer 1

ent AB .. The mean of the Mean diameter 아,he head d 3m The Suupended oHeti oo lb Tt - u 036 4) 0.2

2 300 x 올 lan (15.251 : Couple Teauied he colla, cupu