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Trepanning
circles the size required for my sandwich mirror experiment did not
seem practical so I decided to try using my small diamond bladed tile
saw. A circle the size of the proposed mirror was marked out on
the glass and straight cuts made to rough out the blank. A wooden
extension was added to the edge of the saw table and a lazy susan
bearing loosely attached to it with one screw at the back so that the
center of the bearing was on a line at right angles to the side of the
saw blade where the glass would be in contact. A wooden circle
that fit loosely inside the bearing was siliconed to the center of the
mirror circle, and a strip of wood the thickness of the bearing placed
beside the blade to support the glass. The blank is spun on the bearing
to knock off the high spots, then the bearing is nudged a little closer
to the blade and spun again. Repeat a few times and low and
behold, a very nice circle! The usual precautions apply, outside if
possible, lots of water, face mask, mitts (I didn't but the blood
letting was surprisingly minimal} |
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If the tile saw can cut
circles, why not ellipses? Here's how. Make up a jig on the
edge of a 2 X 4 by cutting out a V groove along it's edge and a
slot at 45°. Cut a dowel in two at 45º and
hot glue the diagonal blank between the sections of the dowell.
Make up a spit
that rests against the fence, {tilt the table to allow a bigger ellipse
to be cut} and slide the skewer back and forth while rotating and out
comes a diagonal.
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Last revised - 19 Mar 09