So I tried it, and here's the result:
Here's the 0.7 module metric gear (84 teeth, 6 mm bore) that we used on our current gearboxes (you know, the 3-motor, 2-speed, shift-on-the-fly ones...
). It's in AutoCAD 2000 .dxf format (zipped for fun),
Sure enough, the teeth are composed of little surfaces (0.001" long, or so), which approximate an involute. Does anyone have any experience feeding this sort of shape to an EDM, waterjet or laser, and if so, would it work without choking on the tiny little segments?