Definition of Cam
A cam is a mechanical member used to impart desired motion to follower by direct contact
Cam and follower combination belongs to the category of higher pairs.
Necessary members of cam and follower mechanism are
- A driver member known as cam
- A driven member known as follower
- A frame which supports the cam and guides the follower
Types of Cams
Cams can be classified according to
- Follower movement
- Manner of constraint of the follower
Classifications of Cams according to shape
Wedge and flat cams
Radial or disc cams
Classifications of Cams according to follower movement
Rise return rise
Dwell rise return dwell
Dwell rise dwell return dwell
Classifications of Cams according to constraint of the follower
Preloaded spring cams
Positive drive cams
Types of followers
Cam followers can be classified according to
- Movement and
- Location of line of movement
Classifications of followers according to shape
Knife edge follower
Mushroom (or Spherical) follower
Plate type follower
Classifications of followers according to movement
In this type, as the cam rotates, the follower reciprocates or translates in the guides.
The follower is pivoted at a suitable point on the frame and oscillates as the cam makes rotary motion.
Classifications of followers according to line of movement
The follower is known as a radial follower if the line of movement of the follower passes through the centre of rotation of cam.
If the line of movement of follower is offset from the centre of rotation of the cam, the follower is known as an offset follower.