Discussion
The radial difference between pitch circle and tip circle is equal to
Answer: A
The radial distance between the pitch circle and the tip circle equals the module.
That distance is the addendum, the height of the tooth above the pitch circle. For standard full-depth involute gears in the module system, addendum = 1 × module (m). So the tip (outside) circle diameter is \(d + 2m\).
2 × module is the sum of the addenda of two meshing gears, the working depth. 1.157 × module is the dedendum, which lies below the pitch circle, and 0.157 × module is the clearance, the gap between the tip of one tooth and the root of the mating gear.
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