Theory of Machine
If some links are connected such that motion between them can take place in more than one direction, it is called

Incompletely constrained motion
Successfully constrained motion
Completely constrained motion
Partially constrained motion

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Theory of Machine
The contact ratio is given by

(Length of the path of approach)/(Circular pitch)
(Length of the arc of approach)/cosφ
(Length of the arc of contact)/(Circular pitch)
(Length of path of recess)/(Circular pitch)

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