Cam and Cam Followers

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CAMAND

FOLLOWERS


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INTRODUCTION:

The cam and followeris a device which can

convert rotary motion (circular motion) into

linear motion (movement in a straight line).

Cam - A mechanical device used to transmit

motion to a follower by direct contact

A cam is a rotating machine element which

gives reciprocating or oscillating motion to

another element known asfollower.

The cam and the follower have a line contact

and constitute a higher pair.

Cam

Follower


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APPLICATION:

operating the ale! in internal "om#$!tion

engine!% te&tile ma"hine tool!% paper "$ttingma"hine!% 'ee( me"hani!m o' a$tomati" lathe%!wit"he! et")

Control themovement of the Cams used ipump.


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In IC engines to operate the inlet and ehaust valves


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Cla!!i*"ation o' Follower:

!) Acco. To surface in contact"

a) #nife edge follower" $hen the contacting end of the follower has a sharp knifecalled a knife edge follower.

b) &oller 'ollower" $hen the contacting of follower is a roller% it is called roller fo

c) 'lat faced or ushroom 'ollower" $hen the contacting of follower is a perfect

it is called 'lat faced follower.

d) pherical faced follower" $hen the contacting of follower is of spherical shape%

spherical faced follower.


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+

Types of Followers

Flat,Fa"eFollower

M$!hroo

mFollower

Roller

Follower


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*. Acco. To the motion of follower"

a) &eciprocating or translating follower" $hen the follower

reciprocates in guides as the cam rotates uniformly% it is known as

reciprocating or translating follower.

b) +scillating or rotating follower" $hen the uniformly rotary motio

the cam is converted into predetermined oscillatory motion of the

follower.

,. Acoo. to the path of motion of the follower"

a) &adial follower

b) +ff-set follower


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Classification of CA"

!. &edial or disc cam"

In radial cams% the follower

reciprocates or oscillates in a

direction perpendicular to the cam

ais.

*. Cylindrical cam"

In cylindrical cams% the follower

reciprocates or oscillates in a

direction parallel to the cam ais.

&edial ca

Cylindrical


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Term used in &adial CA"

1. Base Circle" It is the smallest circleto the cam profile.

2. Trace point" It is a reference poin

and is used to generate the pitch cur

3. Pressure angle" It is the angle betw

of the follower motion and a no

curve.

4. Pitch point" It is a point on the pitc

maimum pressure angle.

5. Pitch circle" It is a circle drawn from

cam through the pitch point.


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6. Pitch curve" It is the curve generated

by the trace point as the follower

moves relative to the cam.

7. Prime Circle" It is the smallest circle

that can be drawn from the centre ofthe cam and tangent to the pitch

curve.

8. Lit o stro!e" It is the maimum

travel of the follower from its lowest

position to the top most position.


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otion of 'ollower" The 'ollower% ($ring it! trael% ma- hae one o' the 'ollowing mo

1. Uniform velocity,

2. Simple harmonic motion,

3. Uniform acceleration and retardation,

4. Cycloidal motion.

Cam and Cam Followers

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