You can buy gears off the shelf, of course, and get accurately machined parts exactly to your chosen ... to allow the gear teeth to be cut to an appropriate depth. The method of action is simple.

The mysterious Antikythera Mechanism is 2,000 years old and has long puzzled scientists. New research into its ...

A gear close gearA gear is a mechanical part ... is a special wheel that has parts called teeth around its outer edge (its circumference close circumferenceThe circumference is the measurement ...

Gears can change the direction or the speed of movement. As there are teeth around the edge of the gears they grip together and so can withstand a greater force, enabling them to move large items ...