From: "CSC" 
To: "Atm" 
Reply-To: "CSC" 




Right.  My first mirror got wasted, too.

Use the old tool.  Grind it all over to preserve it's shape.  No sense in
flattening the center down, only to need it later.

I like channeled tools.  Fine grinding goes better, I think, and less
sticking problems.  It would be easy to grind a few grooves in your old
tool, too.  Make a wooden holder like a miter box and use a strip of sheet
metal, an old saw blade or whatever to grind in 3-4 criss-cross lines,
maybe 1/8" deep  Use 80 grit or so.  Goes fast, much fun.

Chamfer all over.  Chamfer early and often.  Any sharp edge might get
chipped, and just where do you think that little glass chip went?  Keep a
healthy chamfer on everything and you'll avoid cosmetic and optical
heartbreaks.

Colin



-----Original Message-----
From: owner-atm{at}shore.net [mailto:owner-atm{at}shore.net]On Behalf Of
kenneth durkin
Sent: Saturday, April 12, 2003 12:38 PM To: atm{at}shore.net
Subject: ATM Reusing Glass Tool/Chamfering/Concentric Ridges



I'm about to start on my second six inch mirror.  My first ended in
disaster last summer when my foot knocked it off the stairs it was resting
on.  I knew better, I had been meticulous in storing it, gentle in handling
it, my poor mirror, always so careful, why did I do it... Oh yes, excuse
me, my questions. :)

Before disaster struck I was at the polishing stage of an F5.  Can I use
the old plate glass tool to make this new mirror which will also be an F5? 
Anything I need to be wary of (besides my foot)?  Then, I could save the
glass tool I got with the new kit and use it for yet another mirror some
day.  I'ld rather not make a tile tool just now, so will use the new tool
that came with the kit if I have to.

My other question concerns chamfering. Texereau says to chamfer both sides
of the tool and mirror.  Is that really necessary or can I get away with
chamfering just the face of each that will be making contact with the
other?

Oh, and just out of curiousity.  Though I've read that those concentric
ridges on the tool are designed to keep grit in, is there anything
intrinsically wrong with just using the flat surface instead?  That's what
I did last time, in part out of ignorance, but I also wanted the experience
of doing the whole thing myself without the "help" from the
ridges.

Thanks for any assistance you can offer.

Ken

U.S. Consul
Casablanca, Morocco
visit my atm site for beginners at
www.geocities.com/kendurkin/index

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