Design & Technology
There are four basic types of motion in mechanical systems:
Many mechanisms take one type of input motion, and output it as a different type of motion. Below are some examples.
A chain and sprocket changes rotary motion to linear motion - or vice versa. A wheel-and-axle, rack-and-pinion, rope-and-pulley, screw thread, or chain-and-sprocket could also be used for this.
A cam-and-follower changes rotary motion to reciprocating motion. A crank, link and slider or rack-and-pinion could also be used for this.
A peg-and-slot changes oscillating motion to rotary motion. A crank, link and slider could be used for this, and also to change rotary to oscillating motion.
4. A crank, link and slider will change rotary motion to oscillating / reciprocating motion.
A rack-and-pinion changes rotary motion to reciprocating motion. A crank, link and slider could also be used for this. A cam-and-follower will change reciprocating to rotary motion.
Small systems can be combined to make more complex systems. A cam which is turned by an electric motor can operate a micro switch which could be used to turn a light on or off. Two mechanical systems can be connected together to give complex movements.
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