A shaft is supported on bearings A and B, 800 mm between centres. A 20°
straight tooth spur gear having 600 mm pitch diameter, is located 200 mm to the right of the left hand
bearing A, and a 700 mm diameter pulley is mounted 250 mm towards the left of bearing B. The gear
is driven by a pinion with a downward tangential force while the pulley drives a horizontal belt
having 180° angle of wrap. The pulley also serves as a flywheel and weighs 2000 N. The maximum
belt tension is 3000 N and the tension ratio is 3 : 1. Determine the maximum bending moment and the
necessary shaft diameter if the allowable shear stress of the material is 40 MPa.
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