Theory of Machine
A kinematic chain requires at least

3 links and 4 turning pairs
2 links and 3 turning pairs
4 links and 4 turning pairs
5 links and 4 turning pairs

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Theory of Machine
In gears, interference takes place when

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

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