1. A 3.6 m long shaft carries three pulleys, two at its two ends and third...

 

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1. A 3.6 m long shaft carries three pulleys, two at its two ends and third at the mid-point. The two end pulleys has mass of 85 kg and 20 kg and their centre of gravity are 3 mm and 5 mm respectively from the axis of the shaft. The middle pulley mass is 50 kg and its centre of gravity is 8 mm from the shaft axis. The pulleys are so keyed to the shaft that the assembly is in static balance. The shaft rotates at 600 r.p.m. in two bearings 2.4m apart with equal overhang on either side. Determine: i. the relative angular positions of the pulleys, and ii. dynamic reactions at the two bearings. 2. Design a four bar Grashof; crank-rocker mechanism to give 90° of rocker motion with equal time forward and back, from a constant speed motor input. The output link has a length of 900mm. 3. Determine the mobility of the mechanisms shown below Cylinders roll without slipping b. 66 1. A 3.6 m long shaft carries three pulleys, two at its two ends and third at the mid-point. The two end pulleys has mass of 85 kg and 20 kg and their centre of gravity are 3 mm and 5 mm respectively from the axis of the shaft. The middle pulley mass is 50 kg and its centre of gravity is 8 mm from the shaft axis. The pulleys are so keyed to the shaft that the assembly is in static balance. The shaft rotates at 600 r.p.m. in two bearings 2.4m apart with equal overhang on either side. Determine: i. the relative angular positions of the pulleys, and ii. dynamic reactions at the two bearings. 2. Design a four bar Grashof; crank-rocker mechanism to give 90° of rocker motion with equal time forward and back, from a constant speed motor input. The output link has a length of 900mm. 3. Determine the mobility of the mechanisms shown below Cylinders roll without slipping b. 66

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Answer length of shaft 36m two end pull... View the full answer