Descripción: Cam Design and Manufacturing Handbook
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Cam and Follower •
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A cam is a mechanical member used to transmit desired motion to the follower by direct contact. They are used to convert rotary motion into oscillatory motion or oscillatory motion into rotary motion. There are two links namely the cam itself which acts as an input member. The other link that acts as an output member is called the follower. In a cam-follower cam-follower pair, pair, the cam usually rotates rotates while the follower reciprocates reciprocates (translates )or oscillates. Complicated output motions which are otherwise difficult to achieve can easily be produced with the help of cams. Cams are widely used in internal combustion engines, machine tools, printing control mechanisms, textile weaving industries, automated machines etc.
Necessary elements of a cam mechanism are: •A driver member known as the cam •A driven member called the follower follower er •A frame which supports the cam and guides the follow
Classification of Cams A Cam can be classified in two ways: Radial or Disc cam
: In radial cams, the follower reciprocates (translates) in a direction perpendicular to the cam axis. Cylindrical cam
: In cylindrical cams, the follower reciprocates or oscillates in a direction parallel to the cam axis. The follower rides in a groove at its cylindrical surface.
Radial or Disc Cam
Cylindrical Cam
Classification of follower A follower can be classified in i n three ways:ways:•
According to the motion of the follower.
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According to the nature of contact.
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According to the path of motion of the follower.
According to the motion of the follower •
Reciprocating or Translating follower
When the follower reciprocates in guides as the can rotates uniformly, it is known as reciprocating or translating follower. •
Oscillating or Rotating follower
When the uniform rotary motion of the cam is converted into predetermined oscillatory motion of the follower, it is called oscillating or rotating follower.
Oscillating or rotating follower
Reciprocating or translating follower
According to the path of motion of the follower. Radial follower
When the motion of the follower is along an axis passing through the centre of the cam, it is known as radial follower. Off-set follower
When the motion of the follower is along an axis away from the axis of the cam centre, it is called off-set follower.
