Problem 1: (40 pts) Select: 1) a deep groove ball bearing for the lower bearing, A 2) a cylindrical roller bearing for the upper bearing, B of the vertical shaft shown in the figure. The resultant force acting on the pulley is 5340 N. Base the selection on a life of 9,000 hours and 90% total reliability for the two bearings assembly. The minimum shaft diameter based on strength is 23.8 mm. the shaft rotates at 300 rpm. The loads are applied with light to moderate impact. 13.5 cm 27 cm Weight of shaft and pulley = 890 N Belt Pulley 5340 N 300 rpm

Fig: 1