Re: Ideas for finishing pinhole

Jeff,
        You could probably find Aluminum oxide at a science store or if there is
one in your location, at a lapidary supplier. You could also use the rubbing
paste auto painters use to polish cars after they have been painted.

A better idea would probably be to thin the material by hammering with a ball
hammer against a solid metal surface, like blacksmiths do. Aluminum is soft so
there is no need for heating it, I believe. A better material than the brittle
alu.pie is the aluminum of a pop can, sand the non printed side (first or last)
as it has a plastic like coating.

And finally, if you don't want to be thinning material, you could go to a
automobile parts store and buy BRASS SHIM STOCK, they sell it in different
thickness, you may want 0.001", 0.002" or 0.003", these guys call it 1 thou, 2
thou and 3 thou (thou as in thousand). 0.002" is generally the best thickness,
IMO. not too thick that causes fast fall off, not too thin that is difficult to
work with.

Guillermo

----- Original Message -----
From: "Jeff" <jrodgers@elite.net>
To: <pinhole-discussion@pinhole.com>
Sent: Tuesday, March 26, 2002 1:12 AM
Subject: [pinhole-discussion] Ideas for finishing pinhole

Hello, made my first pinhole from aluminum pie tin, but I need to thin the
material some more. Sanded with 600 wet/dry paper, but have a better idea: using
fine grit and a marble, a "concave" surface could be formed... hopefully at it's
thinnest near the pinhole. Anyone tried similar method? I'm trying to find a
source for the grit (like is used to grind glass) and hopefully don't have to
mail order. Any suggestions for where to find this stuff locally?
Received on Tue Mar 26 07:55:08 2002