The shafting shown in Figure 2.51 was taken from a mill transfer chain that was frequently overloaded, causing the shaft (made of low-carbon steel) to fail by torsion shear. It has obviously been loaded in torsion beyond its elastic limit into the plastic range and has taken a permanent set. Since the sprocket and bearing bores are bot easily changed to substitute a larger diameter shaft, what type of replacement shaft will solve the problem?

(7) A clutch system is to be designed to transmit 800 ft-lb of torque. A multi-plate clutch in an oil bath is found to be suitable for this application. The outer disk diameter is to be limited to a maximum of 7 inch. Design data for molded friction material and steel disk is Pmax = 160 psi and f = 0.11. Determine inner diameter of disks, clamping force and number of disks. Assume inner diameter of disk = 0.5 * outer diameter. Assume uniform rate of wear at interface (List necessary assumptions, make suitable sketch & label it, write conclusions).

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A car jack uses a single square-thread screw to raise a known load. The major diameter and pitch of the screw and the thrust collar mean diameter are known. Running friction coefficients are estimated. Find:  (a) Determine the thread depth and helix angle. (b) Estimate the starting torque for raising and lowering the load. (c) Estimate the efficiency of the jack for raising the load.  (d) Estimate the power required to drive the screw at a constant 1 revolution per second. Schematic and Given Data: Load 50 kN NOTE: ANSWER ONLY LETETRS C AND D.