Re: ATM 10" Flex Mirror

["Bill & Lois Kelley" <wekelleylwk@sedona.net>]

Dennis,
Parabolize it if you wish, but, every flat back mirror I have flexed has had
scratches on the back. One was loaded to nearly 300 pounds of tension.
They don't crack.
Regards,
Bill Kelley


----- Original Message -----
From: "Dennis Nikitin" <ndenis@sarkor.com>
To: <atm@shore.net>
Sent: Friday, January 11, 2002 1:10 PM
Subject: Re: ATM 10" Flex Mirror


>
>
> > I have a Dan Cassaro 10" plate glass mirror polished out to a good
> > sphere, ready to be coated and flexed.  However, I am now having second
> > thoughts.  There are a couple of pretty large scratches on the back,
> > which is how the blank came from Dan.  I didn't think much about them,
> > but now I am concerned that one or more of them will develop into
> > fractures when subjected to 130lbs of flexing force.
>
> Take a piece of window glass and make some large scratches, then subject
the
> piece to some flexing force. Will the scratches turn into fractures? I
don't
> think so. They would if you knock the piece by a hummer but only if the
> scratches are really deep and long. Anyway try it with any piece of glass.
>
> >Should I bag the flexing and
> > parabolize?  Thanks.
>
> PARABOLIZE IT DENNIS!!!! You will get a lot of fun.
>
>
> Dennis Nikitin
>
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