When the two outputs were superimposed, the tooth forms were almost the same but not quite. It worked ok for wheels with less teeth though. It froze when I tried ‘normal’ resolution. One issue was that this 72 tooth wheel only worked at ‘draft’ resolution in Hessmer’s online gear maker. Anagnostou’s version saved at 139kB, while Hessmer’s version saved at 90kB. Hessmer’s was made from 1800 straight line segments. Anagnostou’s drawing was made from 288 arcs and nurbs curves. The wheel was N=72 teeth, PCD=36" pitch circle dia, and 20deg pressure angle. I compared the filesize of a gearwheel drawn by Hessmer and that by Anagnostou. (Incidentally, there is now a tutorial for Anagostou’s plug-in, written by a third party, at I thought I would compare this with GearGen, a script by Thomas Anagnostou that for many years has been old standby for Rhino This means it will properly handle undercuts in pinions of low tooth count. It uses an iterative computational method based on Zalewski’s approach. It outputs the drawing to dxf, which you can have open directly in Rhino from the browser. Rainer Hessmer has just developed an online "Involute Spur Gear Builder" But extra to this, he also has a graphical technique for deriving the tooth form based on the rolling motion of the teeth when they mesh - a different approach from the usual computation of an involute curve. Zalewski gives good ideas on drawing some complex gear forms in Rhino, that I found useful. This is the “Guerrilla guide to CNC machining, mold making, and resin casting” © 2013 by Michal Zalewski,
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.
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