1. The layout of a transmission shaft carrying two pulleys B and C and supported on bearings A and D is shown in the figure below. Power is supplied to the shaft by means of a vertical belt on the pulley B, which is then transmitted to the pulley C carrying a horizontal belt. The maximum tension in the belt on the pulley B is 2.5 kN. For pulley B, P2.125 Pand for pulley C, P=2.125 P4 The shaft material has Sy+= 400 N/mm2 and the factor of safety is 3. Determine the shaft diameter on strength basis. Neglect the weights of the pulleys. It would be easier if you follow the following steps. (a) Determine the permissible stress (b) Torsional moment (c) Bending moment (d) Determine the resultant moments at B and C 35 100 (e) Draw the bending moment diagrams in vertical and horizontal planes (i.e. sketch to show accurately the calculated values) (f) Determine the resultant bending moment and torsional moment (g) Determine whether stresses are maximum at B or C (h) Calculate the shaft diameter. P-2.125 max=2.5KN Tmax=2.5KN 183 200 mm M 600mm C A 200 R = 250 mm ' mm R2 =125 mm