Gear Teeth Profile

If you have a legitimate, registered copy of AutoCad^® ask Autodesk.

For gear geometry, you could check out an edition of Machinery's Handbook. The profile is an involute of a circle. Envision a string wound around a circle. As you unwind the string, a given point on it traces the desired curve. The radius continuously varies, so I think you can only approximate the curve in a piecewise manner. In hand drafting, this was done by just a few arc segments. Or you can determine a few points and connect them manually with a French curve, or in AutoCAD with the PLINE command and FITCURVE or SPLINE option. Mirror the curve to form the other side of the tooth; then POLAR ARRAY by the number of teeth.