Re: [ATM] Quartz blanks

[John Lynch <john_lynch2006@yahoo.com>]

To all:

About a year ago, I contacted Corning about an 8"
quartz blank, and the guy quoted a price that (if
I recall correctly) was about $1,500.00.  My 
impression was that they don't typically market 
small telescope making materials, so the quote was
ridiculously high.  You might have better luck with 
the larger sizes.  I'm a member of the American
Astronomical Society, and each year they publish a
member directory.  Also included is a list of
corporate sponsors (and contacts), which includeed
Corning Glass Works up to 2003.  The listing for
Corning was Robert K. Jones in the Advanced Products
Department, and his telephone number was (607)
974-7630.  Email address was the following: 
jonesrk@corning.com.  

Hope this helps.

John Lynch

--- Mike Lockwood <melockwo@uiuc.edu> 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
> 
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 


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