Re: [ATM] Quartz blanks

[Bill Prewitt <bprewitt@neo.rr.com>]

Cincinnati gasket cuts & blanchard's quartz, zerodur, pyrex, etc.
http://www.cincinnatigasket.com/

Their business is mostly for furnace windows.
I got a 30" pyrex blank from them.
They waterjet-cut pyrex, and bandsaw fused quartz and similar materials 
from bulk ingots.... can cut to thickness you specify.

     Bill Prewitt
**********************
www.astrocaver.com



Mike Lockwood wrote:
> 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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> 

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