Instruction: • Use α = 20 B = 20 1. A uniform diameter shaft carrying two pulleys is shown in FIGURE Q1. Pulley A receives power from a motor through a belt with the belt tensions shown. The power is transmitted through the shaft and delivered to the belt on pulley B. Assume the belt tension on the loose side at B is 0. 5(a+ B) percent of the tension on the tight side. 250-mm dia. 230 mm T₂ 280 mm 30-mm dia. loo 400-mm dia. 1800 N 300 mm 270 N FIGURE Q1 i. Determine the tensions T₁ and T₂ in the belt on pulley B and draw bending-
MEB3023: Mechanical Engineering Design moment diagram for the shaft. LW8 [8 marks] ii. The shaft is suggested to be machined from AISI-1035 steel with Sy = 270 MPa. Evaluate the design to confirm if the suggested material is indeed appropriate. If not, then propose a suitable material from TABLE-A.1 in the Appendix. [7 marks] iii. Select a deep-groove ball bearing for use at support O. Assume that the shaft rotates at 300 rev/min and the desired life and reliability for the bearing is 50,000 hours and 0.9, respectively. The load application factor is 1.3. [5 Marks]
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