Circular pitch. Distance along the pitch circle between corresponding profiles of adjacent teeth. ... Circular tooth thickness. Length of arc between the two sides of a gear tooth on the pitch circle.

1. M – angle of trapezia tooth roughing hob. 2. S1, S2 thickness of tooth. 3. D – pitch circle diameter spline shaft (take from the books) 4. B1, B2 – spline roughing thickness. 5. H – addendum of ...