Cams and Followers

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Cams & Followers Syllabus:

Concept & definition of cam & follower, types, classification, different follower motions, their displacements like uniform velocity, S.H.M., uniform acceleration & retardation, Drawing profile of plate cams by graphical method. 1) Define cam and follower.

A cam may be defined as a rotating machine part designed to impart reciprocating and oscillating motion to another machine part, called a follower. 2)Why are cams required? Or Necessity of cam and follower mechanism.

In machines, particularly in typical textile and automatic machines, many parts need to be imparted different types of motion in different planes in a particular direction.. Change of circular motion to translatory motion of simple harmonic type and vice versa can be done by slider crank mechanism. But now the question arises, what to do when circular or rotatory motion is to be changed into linear motion of complex nature or into oscillatory motion. This job is well accomplished by a machine part known as cam and follower. 3) Where are cam and follower mechanisms used? Or State applications of cam and follower mechanisms?

Ans: Cam and follower mechanisms are used in modern machines for example for operating the valves in I.c. engines, textile machine tools, paper cutting machines, feed mechanisms of automatic lathes, switches etc. 4) Out of cam and follower which is the driver and which is driven and why? Cam – driver; Follower – driven because cam imparts reciprocating and oscillatory motion to another part called as follower.

5) Choose the correct option for the following
In a cam and follower mechanism,
a) Follower normally rotates while cam may translate or oscillate. b) Both cam and follower oscillates
c) Cam normally rotates while the follower may translate or oscillate. d) Both cam and follower rotates
6) Classify various types of cams.
Ans: Cams are classified on the basis of Physical shape:
1.Radial cams, disc or plate cams
In the figure shown...
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