Re: [ATM] mirror grinding

["David Harbour" <scarab2@cox.net>]

Bob-

I have often thought about this: why couldn't a guy, who knew he was going
to do a deep (fast) large mirror, start with a flat tiled, channeled tool,
with say, three or four layers of tiles epoxied on at first! THEN HE
WOULDN'T HAVE TO RE-TILE!!!! HAS ANYONE EVER THOUGHT OF THAT?

You are right: fast mirrors will require re-tiling; but what about a tool
that already has three (or four) layers of tiles already on it? This way a
guy could even start with larger tiles. I used to use one inch Winburn hex
tiles (they have gone out of business). I have always used (for curve
generated, and flat tools) tools made of one inch diameter Winburn hexes. I
wax the channels (mostly so grit won't quickly run away, which I discovered
it did, with mirror on top, and the channels left deep). Of course, I always
used the one inch tiles; but a guy could use two inch Winburn hexes, if he
had about four layers of them. Has anyone ever tried that? I wish (kind of)
that I was doing a monster mirror, and had the you know whats to try it.
What do you think? A multi-layer tile tool, that does not need re-tiling?
Your insight and judgement form the primary source of wisdom on this list.
Render your judgement, Honorable Judge May... am I crazy? Will you have to
order an issue to lock me up in a mental institution?

I will go willingly, if you send me to a place that has gorgeous nurses-

Dave in Oklahoma (oops! "Okrahoma")

Thanks, Bob-
Dave


----- Original Message ----- 
From: "Bob May" <bobmay@nethere.com>
To: <atm@atmlist.net>
Sent: Monday, June 27, 2005 12:49 PM
Subject: Re: [ATM] mirror grinding


> BEFORE you start with making another tile tool, grab a piece of iron (like
a
> 3" pipe end cap) and dig the hole that you need in the two mirrors and
then
> cast the tile tool on one of them.  Try to get an approximately spherical
> surface on the two pieces of glass and you won't have to make another
tool.
> I've broken tools apart after the grinding and polishing were done and
have
> found that over 3/4 of the tile thickness is still there after the mirror
is
> done.
> You can't do a mirror from the flat with a tile tool unless the curvature
is
> very gentle.
> Bob May
> bobmay@nethere.com
> http://nav.to/bobmay
> http://bobmay.astronomy.net
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>


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