Theory of Machine
The working depth of a gear is the radial distance from the

Addendum circle to the clearance circle
Top of a tooth to the bottom of a tooth
Pitch circle to the top of a tooth
Pitch circle to the bottom of a tooth

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Theory of Machine
In a single slider crank chain

Three are turning pairs and one is a sliding pair
Each of the four pairs is a turning pair
One is a turning pair and three are sliding pairs
Two are turning pairs and two are sliding pairs

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