laser cutting  INVOLUTE GEAR : It's amazingly simple with this Sketchup plugin.

Lasers
,
1

laser cutting INVOLUTE GEAR :
It’s amazingly simple with this Sketchup plugin.
https://sites.google.com/site/spirixgear/

2

Sketchup (2015&2016) to SVG (inkscape):

3

@StephaneBUISSON Love that plugin. I also like this one for spirals : https://extensions.sketchup.com/en/content/curve-maker

4

I know that one it was before here
http://www.drawmetal.com/