Can You Solve These Problems With Explanation 1 (202.56 KiB) Viewed 39 times
Can You Solve These Problems With Explanation 2 (202.56 KiB) Viewed 39 times
16. A 75 mm diameter shaft revolves at 300 rpm. A vee pulley transmitting 60 kW is keyed to the shaft with a 22 width x 14 thickness x 128 long parallel key. Materials of construction: Key... Fy = 414 MPa Shaft... CS1040 Fy = 270 MPa Vee pulley... Grey cast iron Check the safety of the key design. Show steps clearly. 17. A solid round shaft is to transmit 80 kW at 200 rpm. Determine the shaft size using CS 1030 black steel. Given the endurance limit for CS1030 = 225 MPa, Safety factor = 2, Stress concentration factor = 2. a) Calculate the torque T. b) Calculate the allowable torsional shear stress Txy using the formula below: Endurance Limit Allowable stress = Safety Factor x Stress Concentraion Factor c) Calculate the shaft size using 18. A pulley 200 mm diameter rotating at 1200 rpm drives a machine by means of a vee belt. The angle of contact of the belt on the pulley is 170°, the tension in the tight side is 1200 N and the coefficient of friction of the contact surfaces is 0.25. The half groove angle a = 20°. Calculate the power transmitted. 19. A solid circular shaft with a straight parallel keyway is shown in the Figure. The shaft has a diameter of 50 mm and it rotates at 500 rpm. Given that the fillet radius in the keyway r = 0.5 mm, determine the maximum power that can be transmitted without exceeding an allowable shearing stress of 50 MPa. b=1/44 3.8 4/8 3.4 3.0 K, 26 0.04 0.06 0.08 0.10 0.12 rid (b) Practice 2.2 1.8 1.4 1.0 0 0.02
16. A 75 mm diameter shaft revolves at 300 rpm. A vee pulley transmitting 60 kW is keyed to the shaft with a 22 width x 14 thickness x 128 long parallel key. Materials of construction: Key... Fy = 414 MPa Shaft... CS1040 Fy = 270 MPa Vee pulley... Grey cast iron Check the safety of the key design. Show steps clearly. 17. A solid round shaft is to transmit 80 kW at 200 rpm. Determine the shaft size using CS 1030 black steel. Given the endurance limit for CS1030 = 225 MPa, Safety factor = 2, Stress concentration factor = 2. a) Calculate the torque T. b) Calculate the allowable torsional shear stress Txy using the formula below: Endurance Limit Allowable stress = Safety Factor x Stress Concentraion Factor c) Calculate the shaft size using 18. A pulley 200 mm diameter rotating at 1200 rpm drives a machine by means of a vee belt. The angle of contact of the belt on the pulley is 170°, the tension in the tight side is 1200 N and the coefficient of friction of the contact surfaces is 0.25. The half groove angle a = 20°. Calculate the power transmitted. 19. A solid circular shaft with a straight parallel keyway is shown in the Figure. The shaft has a diameter of 50 mm and it rotates at 500 rpm. Given that the fillet radius in the keyway r = 0.5 mm, determine the maximum power that can be transmitted without exceeding an allowable shearing stress of 50 MPa. b=1/44 3.8 4/8 3.4 3.0 K, 26 0.04 0.06 0.08 0.10 0.12 rid (b) Practice 2.2 1.8 1.4 1.0 0 0.02
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