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Subject: Re: [Homebrew_PCBs] Circle

From: JanRwl@...
Date: 2007-03-05

In a message dated 3/4/2007 12:38:27 P.M. Central Standard Time,
alan00463@... writes:

Has anybody ever cut, or tried to cut, a PCB in the form of a circle? If so,
how?<<
Use a plywood fixture on a bandsaw. Or, if you are very skilled, make a
fixture for your router, using a CARBIDE-edged bit!

Or, if you are a lathe operator, first draw the circle with a Sharpie pen on
a sheet of FR-4 (or whatever), then manually bandsaw "outside" of the marked
circle (leaving 1.5-3 mm waste). Then fasten the "blank" to a
plywood-covered face-plate on the lathe with double-stick tape, and fasten a disk of
plywood about the dia. of your finished PCB circle over the blank, holding it in
place with a live center in the tail-stock, cranked up nice and hard. Then,
TURN the disk to final dim (and sand it!), being VERY careful. Don't breathe
that nasty glass/epoxy dust! Jan Rowland



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