Rack + Pinion
- used to turn rotary into linear motion
- the pinion (a round gear) is turned to move a flat gear (the rack)
- used on railways on steep sections of track to stop wheels slipping backwards
A Worm Drive + Worm Wheel
- changes the direction of rotation through 90o
- used for tightening guitar strings
Bevel Gears
- also changes direction of rotation through 90o
- the teeth are angled at 45o so the gears fit together at right angles
- used in hand drills
EXAM TIP!! You might be asked to sketch and name it's parts so look up images of mechanisms
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