Machine Design
Oldham coupling is used to connect two shafts

Which have lateral misalignment
Whose axes intersect at a small angle
Which are not in exact alignment
Which are perfectly aligned

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Machine Design
The contact ratio is the ratio of

Length of arc of contact to the circular pitch
Length of path of contact to the circular pitch
Length of arc of approach to the circular pitch
Length of arc of recess to the circular pitch

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