I'm trying to design an acoustic reflector in SW, (I just purchased the2006-2007 student edition). I am able to make a parabolic mirror by doing a revolving cut of a parabola sketch. For example, if the central axis of the reflector/mirror is the z-axis, then the surface changes depth with the radius from the z-axis. So it is symmetric about the z-axis. But does anyone know if it's possible to model a biconic surface? A biconic surface is not symmetric about the central axis. For example, if the central axis is the z-axis, a biconic surface will vary its depth with both x and y. I have the equation for this surface, but how would I model it in SW so that it can be machined?