Re: ATM 8.5" candle mirror update and help!!!

["Kreig McBride" <kmcbride@memes.com>]

Why remove the rim at all?

Cost wise and effortwise it makes much more sense to purchase a good blank
and use this piece of glass as a tool. If this glass is indeed a candle
holder with varying thicknesses, the annealing will most likely be very poor
and you will struggle greatly with figuring.

If you continue with this glass, why not incorprate the rim into the
mount/cell for the mirror itself? No exterior front retaining clips.
I can see where the rim might have some effects on the figure but you will
not know untill you figure it.


-----Original Message-----
From: Viper71049@aol.com <Viper71049@aol.com>
To: atm@shore.net <atm@shore.net>
Date: Monday, July 16, 2001 10:35 AM
Subject: ATM 8.5" candle mirror update and help!!!


>
>Hello All,
>
> Since my grinding machine is complete and I got my 8.5" Cassegrain
Telescope
>design made, I need help on the mirror. I dont need help on grinding or
>polishing I need help on how to remove a rim on the bottom side of the
>mirror. I will explain..
>
> It is a 8.5" mirror with a 3/4" wide rim and about 3/4" deep. Think of the
>mirror as a 7/8" thick flat mirror with a rim on the bottom 3/4" wide and
>3/4" thick. The question is I want this mirror as good as possible and
looks
>good too. How can i remove this "rim"?
>
> Drawing below, Cross Section Side View...
>
> ____________________________
> |   ____________________    |
> |___|                                   |____|
>
> How can I remove this "RIM" and any Ideas? I would think this would cause
>the center to sag and the edge to be normal......
>
> Tony
>