Re: ATM striping and repolishing 4.5 mirror

["Ken Hunter" <kb7h@onemain.com>]

WHOA...

You are trying to figure to a Parabola and the shape seen is the Donut for a
parabola. Practice measuring the donut, tear down the tester and set it up
again and test some more. Find out as much as you can about that donut and
your testing procedures before you touch that surface.

Ken Hunter

----- Original Message -----
From: "Gil or Lisa McFarlane" <doctorgil@peoplepc.com>
To: "atm" <atm@shore.net>
Sent: Saturday, October 06, 2001 6:30 PM
Subject: ATM striping and repolishing 4.5 mirror


>
> Hello all.  I constructed a tester last weekend (following suggestions
> of several web sites), and had tremendous fun checking out a few odd
> mirrors I had laying about.  One, an old 4.5" import, has a donut shaped
> figure in the tester.  I am thinking it might be good for me to practice
> polishing this thing as a warm up for the 8" I will be grinding soon.  I
> suspect I should strip it first.  Any suggestions?
>
> - Gil
>
>
> --
> Gil McFarlane Doctorgil@peoplepc.com  http://www.doctorgil.com
>
> Lisa McFarlane  Lisa@LisaPhoto.com    http://www.LisaPhoto.com
>
>
>