Re: [ATM] Making an exisiting mirror thinner

[<lenses@adelphia.net>]

You will change the figure.

1. Grinding will take a very long time unless you have a machine and then it will still take days.

2. Blanchard grinding is the way to go and would take at least 2 hours of shop time ( most likely more) and you will still change the figure.

In our shop I would charge you $250 to blanchard grind the back side, figure what its worth and no guarantee it won't get broken also. (P.S. I wouldn't do it)

It's easier to start over and make a new mirror.

My .03 cents!
Pete

---- kreig <astroguy@nas.com> wrote: 
> Most likely you will destroy the figure.
> 
> Why not make a trade for a lighter mirror, or sell yours and buy a new one? 
> Life is too short to work on a project with no known outcome.  You can 
> concentrate your time and effort on other projects. What is your time worth?
> 
> my 2 cents . . . .
> 
> Kreig
> 
> 
> 
> 
> ----- Original Message ----- 
> From: "hermit" <hermit@outofoptions.org>
> To: "Chris Todd" <christopher.todd@gmail.com>
> Cc: <atm@atmlist.net>
> Sent: Tuesday, October 09, 2007 7:56 AM
> Subject: Re: [ATM] Making an exisiting mirror thinner
> 
> 
> > Chris Todd wrote:
> >> At first blush, this sounds like it should be easy, but I'm guessing
> >> there are probably practical difficulties in pulling it off (e.g.,
> >> without getting grit on the polished front surface).  Then again, how
> >> long would it take to grind one inch of glass?
> >>
> >>
> > Depending on the size of the mirror, this would be a lot of work and
> > should only be undertaken if absolutely needed.  If the original blank
> > was properly annealed, you 'probably' won't hurt the figure.
> >
> > Ken Lowther
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