The distance between adjacent meshing teeth of mating gear is called
मेटिंग गियर के आसन्न मेशिंग दांतों के बीच की दूरी को कहा जाता है
Clearance,
pitch line
backlash
flank
backlash
Backlash: a clearance between mating gear teeth, is built into speed reducers to let the gears mesh without binding and to provide space for a film of lubricating oil between the teeth.

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