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The amount by which the dedendum in a given gear exceeds the addendum of its mating gear. Also the radial distance between the top of a tooth and the bottom of the mating tooth space.
In bevel and hypoid gears, the distance between the face cone of one gear and the root cone of the mating gear when the two gears are assembled in mesh with each other.
 
Whereas:
From Gear Data
Formula:

 

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