Cams :
A cam is rotating machine element which gives reciprocating or oscillating motion to another element know as follower .
The cams are widely used for operating the inlet and exhaust values of internal combustion engines , automobile attachment of machineries ,paper cutting machines , spinning and weaving textile machineries ,feed mechanism of automatic lathes etc.
Classification of Followers :
1. According to surface in contact :
(a) Knife edge follower
(b) Roller Follower
(c) Flat Faced or Mushroom Follower
(d) Spherical Faced Follower
2. According to the motion of follower :
(a) Reciprocating or Translating follower
(b) Oscillating or rotating follower
3. According to path of motion of follower :
(a) Radial follower
(b) Off - set follower
Classification of cams :
1. Radial or disc cam
2. Cylinderical cam
Terms used in radial cams :
1. Base curcle
2. Trace point
3. Pressure angle
4. Pitch point
5. Pitch circle
6. Pitch curve
7. Prime circle
8. Liftor stroke
Motion of Follower :
1. Uniform velocity
2. Simple harmonic motion
3. Uniform acceleration and retardation
4. Cycloidal motion
Displacement , velocity and acceleration diagrams for the can when the follower moves with the above mentioned motions
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