Theory of Machine
The two parallel and coplanar shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is known as

Helical gearing
Spiral gearing
Spur gearing
Bevel gearing

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Theory of Machine
In gears, interference takes place when

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
Pitch of the gears is not same

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