All:

I need to define a part with that has a solid surface which is a 4th order polynomial of form z = f(r, theta); cylindrical coordinates.

can soldworks do this? I can see how to do equation driven curves, but not surfaces. Do i need to convert to cartesian z = f(x,y) first?

help!

Thanks in advance all

Jason

Jason,

I don't believe SolidWorks has equation driven surfaces. I think you would have to use equation driven curves and loft through them. You may or may not be able to get a shape that is good enough for what you want to do. If you are looking for optical quality results for a mirror or lens you are probably going to be disappointed. Your choices on how many profiles to use and where to place them are probably going to be crucial to getting the "best" surface.

I doubt that converting to cartesian coordinates would help, but it could depending on the shape of your surface. If your shape lends itself to profiles on the theta planes, then cylindrical is most likely the way to go. If you do go with profiles on the theta planes you may want to another type of surface, probably a fill with constraint curves, in the area around r=0 to avoid a singularity in your loft.

You should probably read Matt Lombard's surfacing book, SolidWorks Surfacing and Complex Shape Modeling, before you start.

Jerry Steiger