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Cams: The Shape Is the Instruction
Definition
Cam
A mechanical part that converts rotational motion into linear motion.
How Cams Work
- Cam Profile: The shape of the cam determines the motion it imparts.
- Follower: A component that rides on the cam's surface, translating its shape into motion.
- Camshaft: The rotating axis on which the cam is mounted.
- Crank: In some systems, cams work alongside a crank, which converts rotary motion into reciprocating motion.
Types of Cams and Their Motion
Pear Cam
- Shape: Resembles a pear, with a rounded end and a tapered section.
- Motion: Provides a smooth rise and fall with a dwell period (no movement).
- Uses: Automated machinery where a pause in motion is needed, such as textile machines.
Example
In a sewing machine, a pear cam controls the needle's movement, allowing it to pause at the top and bottom of each stitch.
Circular Cam
- Shape: a circular disc, turning about a point that is offset from its centre.
- Motion: a smooth, uniform rise and fall, with no dwell at any point.
- Uses: Simple applications where consistent motion is required, like rotary pumps.
