上海交通大学：《Design and Manufacturing》课程教学资源（作业）06_Homework Power Screw

ME 371 Power Screw Homework 06 Due in class on OCT.30,2014 CID: Name: Please use A4 size paper and staple them together. 1.Problem1: The C clamp shown in the figure for Prob.8-7 uses a in-6 Acme thread.The frictional coef- ficients are 0.15 for the threads and for the collar.The collar,which in this case is the anvil striker's swivel joint,has a friction diameter of in.Calculations are to be based on a max- imum force of 6 Ibf applied to the handle at a radius of 2 in from the screw centerline.Find the clamping force. Problem 8-7 2.Problem2: Compute the lead angle for the screw of Problem 1.Is it self-locking? Compute the efficiency of the screw. 3.problem 3: Find the power required to drive a 40-mm power screw having double square threads with a pitch of 6 mm.The nut is to move at a velocity of 48 mm/s and move a load of F=10 kN. The frictional coefficients are 0.10 for the threads and 0.15 for the collar.The frictional diam- eter of the collar is 60 mm

ME 371 Power Screw Homework 06 Due in class on OCT. 30, 2014 CID: Name: Please use A4 size paper and staple them together. 1. Problem1: 2. Problem2: Compute the lead angle for the screw of Problem 1. Is it self-locking? Compute the efficiency of the screw. 3. problem 3: