Re: ATM : Hole in the middle

[Donovan Buck <donovan@bravoz.com>]

>               BUT, at the first attempt to polish we found severe
>       scratches and sleeks around the hole from debris picked up
>       from the depressed ring around the "plug". The "plug" was
>       removed and the smoothing was redone.
>               We are now ready to polish but cannot decide how
>       to build a lap that can be pressed properly.
>               Hope some one out there has beat this problem before.
>       We are wide open for advise or sugestions.
>
>                               HELP !!!     Bob Allen

I've never done this, so this is a shot in the dark. Could you use dental
plaster up to about 1/4" from the surface of the mirror to secure the plug,
and then fill the remaining ring with pitch? You could just leave this in
throughout polishing, and none of that icky plaster stuff would meet the
face of your mirror.




Donovan Buck
Bravo Zulu! Interactive
www.bravoz.com

Be a part of SETI... http://setiathome.ssl.berkeley.edu
It's much more fun than flying toasters.