7-23 In the figure is a proposed shaft design to be used for the input shaft a in Problem 7-22. A ball bearing is planned for the left bearing, and a cylindrical roller bearing for the right. (a) Determine the minimum fatigue factor of safety by evaluating at any critical locations. Use the DE-Goodman fatigue criterion. (b) Check the design for adequacy with respect to deformation, according to the recommendations in Table 7-2. Candidate critical locations for strength: Left seat keyway Right bearing shoulder Right keyway Table A-20 for 1030 HR: 68 kpsi, 37.5 kpsi, 137ut y BS S H= = =