If I needed to make a spiral and I had the formulas for it, I'd generate a
list of coordinates for an approximation to the spiral, so many degrees per
segment, using a spreadsheet and then massage those coordinates into
gerber, which is really simple to write, using a word processor, and then I
would import the gerber. I've made RF patterns from coordinates, but they
were simpler than spirals.
A simple spiral, of course, is one where the radius increases linearly with
the rotation angle, which is really easy to calculate; such a spiral will
have a constant trace spacing.
If I was going to do this more than a couple of times, I'd be tempted to
write a utility to do it.
[EMAIL PROTECTED]
Abdulrahman Lomax
P.O. Box 690
El Verano, CA 95433
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