Theory of Machine
An involute pinion and gear are in mesh. If both have the same size of addendum, then there will be an interference between the

Tip of the pinion and flank of gear
Tip of the gear tooth and flank of pinion
Tip of both gear and pinion
Flanks of both gear and pinion

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Theory of Machine
Pitch point on a cam is

Any point on pitch curve
The point on cam pitch curve having the maximum pressure angle
Any point on pitch circle
The point on cam pitch curve having the minimum pressure angle

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