Gears and Gearboxes Drive Fundamentals, Maintenance & Reliability
Initially, gears were probably made from wood which served the purpose of transmitting motion by engagement of teeth
History of Gears
- Initially, gears were probably made from wood which served the purpose of transmitting motion by engagement of teeth.
- The gears were then made by casting but later on ways of machining and finishing the gears were developed.
- Now surface hardened gears are used with gear finishing like grinding, shaving, honing, lapping etc.
- Tooth modification techniques were developed to achieve uniform load and power transmission.

Gear Fundamentals
Gear Definition
- Gear" in the present context means a toothed wheel of any kind.
- The essential purpose of gear tooth profile is to transmit rotary motion from one shaft to another.
- Since at least two gears are needed to provide a drive, it is convenient when dealing with a pair of gears to refer to the individual members as the pinion and wheel respectively, the pinion having the smaller number of teeth.

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