Re: [ATM] Quartz blanks

["matt" <electro_optic@bellsouth.net>]

Which was the company that declined an order without even quoting first ?
I'm interested in large and thin quartz/fused silica blanks too , so my
question is not academic.

thanks,
matt

-----Original Message-----
From: Mike Lockwood <melockwo@uiuc.edu>
To: ATMList <atm@atmlist.net>
Date: Friday, February 03, 2006 7:06 PM
Subject: [ATM] Quartz blanks


>Hi,
>
>Just wondering if anyone out there had a source for larger quartz
>blanks that they recommended.
>
>I may be looking for a blank or two in the 20" range, ~1.25" thick.
>The use is an astrograph primary (F/3) for a friend, and possibly a
>Cass. primary for myself.
>
>A pyrex mirror has a large focus shift with changing temperature, so
>we are investigating lower-expansion substrates.  If the price is
>astronomical we'll stick with Pyrex.
>
>One company already declined to quote prices, saying they would not be
>competitive.
>
>Also, if anyone is interested in a 20" F/3-generated blank, 1.25"
>thick in Pyrex or Quartz, let me know.  I will likely be putting
>together an order.
>
>You can reply off list if you wish.
>
> Thanks,
>
> Mike Lockwood
>
>
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