Machine Design
The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called

Clearance
Working depth
Face width
Backlash

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Machine Design
The contact ratio is the ratio of

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

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Machine Design
Spring index is

Its capability of storing energy
Load required to produce unit deflection
Indication of quality of spring
Ratio of coil diameter to wire diameter

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