A cam is used to operate a platform that repeatedly lifts boxes for a height of 40 mm as shown.  One cycle of the cam has the following motion requirements:  Rise to 40 mm in 1.5 s, Dwell for 0.25 s, Fall for 20 mm in 1 s; Dwell for 0.25 s; Fall a further 20 mm in 1 s and the cycle repeats after this.  The  required speed of cam is.............rpm and the angle turned by cam during the Rise motion is...........degrees.

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Calculate the helicopter rotor blade’s rotational speed.

A cam is to give the following motion to a knife-edged follower: 1. Outstroke during 75° of cam rotation; 2. Dwell for the next 60° of cam rotation; 3. Return stroke during the next 80° of cam rotation, and 4. Dwell for the remaining 145° of cam rotation. The stroke of the follower is 30 mm and the minimum radius of the cam is 40 mm. The follower moves with uniform velocity during both the outstroke and return strokes. Draw the profile of the cam when (a) the axis of the follower passes through the axis of the camshaft, and (b) the axis of the follower is offset by 25 mm from the axis of the camshaft. Determine the maximum velocity and acceleration of the follower during its ascent and descent, if the cam rotates at 250 r.p.m. Draw the displacement, velocity and acceleration diagrams for one complete revolution of the cam

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