How to model a "Volute" in SpaceClaim
I wrote an add-in to make gears in SpaceClaim. You can see some of the results here: 11 Gear Mobius Strip v2 Public
It also makes spur and bevel gears. The source is here: https://github.com/bcourter/SpaceClaim-AddIns
If you don't have Visual Studio, I can make the binaries available.