
This is the 'Guerrilla guide to CNC machining, mold making, and resin casting' (C) 2013 by Michal Zalewski, Zalewski gives good ideas on drawing some complex gear forms in Rhino, that I found useful. In my search, I came across a site with beautiful graphics that gives techniques using Rhino for creating simple spur wheels, bevel wheels, worm pinions, and helical gears. I tried it out, and thought that the following info might be helpful to others.

While looking for stuff on drawing bevel, helical and worm gears, I came across a new gear generator, posted by Rainer Hessmer three days ago. An open source, browser based utility for calculating and drawing involute spur gears. The FEA is used for the stress calculation because the Lewis. Direct Gear Design® – for Optimal Gear Performance Alex Kapelevich.
