A proposed shaft design is to be supported on two bearings 3

A proposed shaft design is to be supported on two bearings 30 inches apart. A spur gear with a pitch diameter of 20 inches is to be supported midway between the bearings and a pinion having a pitch diameter of 5 inches is to be supported 6 inches to the right of the right hand bearing, The gears have a pressure angle of20deg and are to transmit 150 hp at a speed of 150 rpm. The shaft material is to be 1020 hot rolled steel with a yield strength of 43 ksi and an ultimate strength of 65 ksi. The material has an endurance limit of 30 ksi. The shaft design should have a factor of safety of 2. The center spur gear is 2 inches wide. What should the diameter be next to the center spur gear so that the shaft will not fail due to fatigue. Gear Bearing Bearing Gear 15 in 15 in 6 in 6 in

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