Gear
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A gear or gearwheel, also called a toothed wheel, is a rotating machine part typically used to transmit rotational motion or torque by means of a series of "teeth" that engage with compatible teeth of
Bronze gear with pawl from Luoyang, China, dated to the Warring States period (475–221 BC)
Modern model of a south-pointing chariot
Wooden cogwheel driving a lantern pinion or cage gear
A cast gearwheel (above) meshing with a cogged mortise wheel (below). The wooden cogs are held in place by nails.
Gear shaping
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Gear shaping is a specific machining process for creating teeth on a gear using a reciprocating cutter. Gear shaping is a convenient and versatile method of gear cutting. It involves continuous, same-
Shaping a gear