Spiral toolpath to machine a cone?

[Kitwn]

Anyone know of an easy way to generate a spiral toolpath to machine a smooth (upwards pointing) cone please? Trying to do it the obvious way (3D model > .stl file > CAM > G-code) isn't cool as the polygons in the .stl seem to result in lots of G01 instructions rather than cutting it in arcs/helical sections. If all else fails I'll have to write a spreadsheet to do it, but I fancy it could be a bit of a ball-ache.

I'm afraid I cannot help with an answer to the question, but thanks for planting the idea that you can use a spreadsheet to calculate G-code moves of mathematical shapes. One of those little snippets of wisdom that might be the solution to a problem somewhere in the future. I hope someone else can be slightly more useful.

Kit