Theory of Machine
The Klein's diagram is useful to find

Acceleration of various parts
Displacement of various parts
Velocity of various parts
Angular acceleration of various parts

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Theory of Machine
In gears, interference takes place when

Pitch of the gears is not same
The tip of a tooth of a mating gear digs into the portion between base and root circles
Gear teeth are undercut
Gears do not move smoothly in the absence of lubrication

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