I've been searching for a good solution to draw graphs of mathematical functions in CAD programs but have found none. For example a sun dial can be described in a few functions, or a parabolic reflector could be generated from a parabola.
For the sun dial I successfully used gnuplot to draw the graphs, put them into a dxf and engrave them on a piece of plastic. But it's really not that great; there are inaccuracies in the dxf files generated by gnuplot (for a reason I don't know).
So I wonder how you guys would do this?