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Re: [ATM] Support for slumped mirror

I had an old honest-to-god 6 inch Corning Pyrex  that was giving me fits with a badly turned edge. It was one fo the  ones with a raised ridge around the outside of the back. Suspecting  that might be part of the reason for the edge problem, I took 45  minutes and ground the back flat on a concrete floor with water and 60  grit silicon carbide.
  Guess what - the very next time I got to work on it, the edge was  *perfect*. Cause and effect? One is never sure, but it certainly  appears possible.
  Guy

Jerry Dove <jldove1@cableone.net> wrote:  On Mon, 16 Jan 2006 15:41:49 -0800, you wrote:



 
>
>. . . Richard
>

 That is what I was afraid of happening the way I had started it before. But if I grind and polish with MOT, how
can I keep from having too much pressure and causing heat from my hands. Wouldn't that cause astig. also?

 Jerry
 Kuna, ID.

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Guy  Brandenburg
Washington, DC
My home page:
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
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