A cam operating a knife-edged follower has the following data : (a) Follower moves outwards
through 40 mm during 60° of cam rotation. (b) Follower dwells for the next 45°. (c) Follower returns
to its original position during next 90°. (d) Follower dwells for the rest of the rotation. The
displacement of the follower is to take place with simple harmonic motion during both the outward
and return strokes. The least radius of the cam is 50 mm. Draw the profile of the cam when 1. the
axis of the follower passes through the cam axis, and 2. the axis of the follower is offset 20 mm
towards right from the cam axis. If the cam rotates at 300 r.p.m., determine maximum velocity and
acceleration of the follower during the outward stroke and the return stroke
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Answer:
2. A cam operating a knife-edged follower has the following data :
(a) Follower moves outwards through 40 mm during 60° of cam rotation.
(b) Follower dwells for the next 45°.
(c) Follower returns to its original position during next 90°.
(d) Follower dwells for the rest of the rotation.
The displacement of the follower is to take place with simple harmonic motion during both the outward and return strokes. The least radius of the cam is 50 mm. Draw the profile of the cam when 1. the axis of the follower passes through the cam axis, and 2. the axis of the follower is offset 20 mm towards right from the cam axis. If the cam rotates at 300 r.p.m., determine maximum velocity and acceleration of the follower during the outward stroke and the return stroke.
3. A cam with 30 mm as minimum diameter is rotating clockwise at a uniform speed of 1200 r.p.m. and has to give the following motion to a roller follower 10 mm in diameter:
(a) Follower to complete outward stroke of 25 mm during 120° of cam rotation with equal uniform Acceleration and retardation;
(b) Follower to dwell for 60° of cam rotation;
(c) Follower to return to its initial position during 90° of cam rotation with equal uniform acceleration and retardation ; (d) Follower to dwell for the remaining 90° of cam rotation.
Draw the cam profile if the axis of the roller follower passes through the axis of the cam. Determine the maximum velocity of the follower during the outstroke and return stroke and also the uniform acceleration of the follower on the out stroke and the return stoke.
4. Draw the profile of a cam with oscillating roller follower for the following motion :
(a) Follower to move outwards through an angular displacement of 20° during 120° of cam rotation.
(b) Follower to dwell for 50° of cam rotation.
(c) Follower to return to its initial position in 90° of cam rotation with uniform acceleration and retardation.
(d) Follower to dwell for the remaining period of cam rotation. The distance between the pivot centre and the roller centre is 130 mm and the distance between the pivot centre and cam axis is 150 mm. The minimum radius of the cam is 80 mm and the diameter of the roller is 50 mm.
Answer:
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