CAMS

Presented By:Wahaj Adil

TS-1

What Is Cam?

• A cam is a device which convert rotary motion into linear motion or vice-versa.

•  A cam mechanism usually consists of two moving elements, the cam and the follower, mounted on a fixed frame.

Cam Mechanisms

Necessary elements of a cam mechanisms are:

• A driver member known as the Cam.• A driven member called the Follower.• A frame which supports the cam and guide

the follower.

Types Of Cams

There are many types of Cams. But some of them are given below:

1. Plate cam.2. Face cam.3. Cylindrical cam

Types Of Cam

Plate cam:

Sometimes called a disc, radial or edge cam. Made up of a flat plate or disc with an edge profile to transmit motion.

Face cam:In its flat surface, this rotary cam has a groove cut within follower riding on the face of a disk. It’s motion parallel to the axis of cam.

Types Of Cam

Cylindrical cam:

Sometimes called a barrel cam. It’s curved surface has a groove machined, within which a follower is contained. Cam profile rotates the follower moves upwards. When follower reaches the top, the cam rotates in the opposite direction and moves back down.

Types Of Followers

There are different types of followers but they all slide or roll on the edge of the cam. Various types are shown below:

• Flat Follower.• Point/Knife Follower.• Roller Follower.• Offset Follower.

Types Of Followers

Cam ProfilesCams can be shaped in any number of ways and this is determined by the way the follower is to move. The shape of the cam is called the PROFILE. Examples of various cam profiles can be seen below.

Pear Shaped Cam.

Circular Shaped Cam.

Heart Shaped Cam.

Drop Shaped Cam.

Cam Profiles

Pear Shaped Cam Circular Shaped Cam

Cam Profiles

Heart Shaped Cam Drop Shaped Cam

Cam Displacement Graph

Uses Of Cam:

It is used in cars.

It is specially used in loom machine.

Double overhead cams control the opening andclosing of a cylinder's valves  

Advantages

o Easily designed to coordinate large numbers  of input/output motion requirements.

o Occupy less space.

o Expensive to produce. 

o Easy to obtain dynamic balance.

Bibliography

http://en.wikipedia.org/wiki/Camhttp://www.cs.cmu.edu/~rapidproto/mechanisms/chpt6.htmlhttp://en.wikipedia.org/wiki/Camshafthttp://www.technologystudent.com/cams/cam1.htmhttp://en.wikipedia.org/wiki/Cam_followerhttp://www.technologystudent.com/cams/cam2.htmhttp://www.technologystudent.com/cams/cam10.htm

http://www3.ul.ie/~nolk/cams.htm#PROFILE SHAPES OF SOME

http://en.wikipedia.org/wiki/Camshaft