On Mon, 05 Mar 2007 06:48:10 +0100, <
JanRwl@...> wrote:
>
> 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
If not many need to be done i suppose approximating the shape with any
type of shear or saw will do, followed by sanding to the final dimensions.
Dont breathe the dust.
ST