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Related to Dedendum: dedendum circle
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d] is the diameter pitch; a is the addendum and b is the dedendum as shown in Fig.
2, the radius of the addendum, pitch and dedendum circle at any point can be written as:
Two circular arcs, on the addendum circle and on the dedendum circle, limit an involute tooth with asymmetrical profiles and lateral by two asymmetrical involutes arcs and two fillet curves of the involutes arcs with the root circle.