Tooth surface. The side of a gear tooth. Tooth profile. One side of a tooth in a cross section between the outside circle and the root circle. Involute. A tooth profile generated from the involute ...

Some spare time recently got used-up designing a pair of involute gears – which, it transpires, is easy in principle, once certain almost-impossible-to-obtain facts have been gathered. There are ...

Over the years, these dimensions were standardized ... Angle between a tangent to the involute tooth profile and the radius from the gear axis to the tangent point. Reference circle.

Helical involute gears, generated by [Greg Frost]’s classic OpenSCAD code. The simplest gears, with teeth cut straight across the face of the circumference of a disk, are called spur gears.