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[ATM] RE:anealing
I once bought a 10" by 2" Pyrex blank from one of the well-known (and badly
reputed) suppliers and ended up calling it the Frankenblank. It seemed to
have a life of its own and the figure would change overnight, after a week,
after a month, etc. It seemed like the thing had moods. I suppose it was
badly annealed, maybe not at all. Since then I stay away from the thicker
stuff.
As far as I know the only sources for Pyrex blanks for ATMs are Newport
Glass and Wilhelm-Bell. The latter more expensive than the former but a
little more reliable. Both claim that they anneal the glass but there is
plenty of evidence to the contrary.
If anyone can find a reliable, inexpensive, supplier of annealed Pyrex
blanks from 6 to 24" diameter the ATM world will beat a path to its door.
All seven of us.
Regards,
Julio
-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net]On Behalf Of
atm-request@atmlist.net
Sent: Saturday, May 21, 2005 2:07 PM
To: atm@atmlist.net
Subject: ATM Digest, Vol 17, Issue 22
------------------------------
Message: 16
Date: Sat, 21 May 2005 14:57:43 -0400
From: "john sherman" <atm@mail.johnspics.com>
Subject: [ATM] annealing
To: <atm@atmlist.net>
Message-ID: <200505211457.AA3063349464@mail.johnspics.com>
Content-Type: text/plain; charset=us-ascii
Dave,
>United Lens, a large annealer of all kinds of optical blanks,
My friend just bought 5 large precision-annealed blanks from them. Three
have to be returned because of poor annealing. I have seen the photos of
them thru full-size polarizing sheets. Even the "good" one shows Richard
Schwartz' Satanic Cross. Is there somebody better to buy Pyrex from? (Please
don't say the "N" word!!!)
John
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