Design a cam for operating the exhaust valve of an oil engine. Draw the cam profile and find the maximum velocity and acceleration of the follower during the outstroke. The least radius of the cam is 50 mm, the lift of the follower is 25 mm and the diameter of the roller is 10 mm. The follower dwells for the rest of cam rotation. The angle of ascent the angle of dwell (between ascent and descent) and the angle of descent is 120°, 60°, and 90° respectively. A cam rotating clockwise at a uniform speed of 200 rpm is required to move a roller follower with a uniform and equal acceleration and retardation on both the outward and return strokes. Determine (i) velocity of piston, (ii) angular velocity of connecting rod (iii) position and linear velocity of any point on the connecting rod which has the least velocity relative to crank shaft 2. When it has turned 45° from the inner dead centre position.
The crank makes 180 rpm in the clockwise direction. The crank and connecting rod of a steam engine are 0.5 m and 2 m long respectively. Unique Important Questions – 3rd Semester BE/BTECH AT6302 MECHANICS OF MACHINES UNIT 1 1.
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