Re: [ATM] Quartz blanks

[Richard <cnc@cncservo.co.uk>]

Hi Mike,

Wednesday, February 8, 2006, 4:43:42 PM, you wrote:

ML> I think it is likely we will end up using Pyrex, and in that case the
ML> change in dimension of the telescope structure will make up for some
ML> of the change in focal length of a Pyrex mirror.

Just before you give up Mike, get a quote on Sitall CO-115M
Astrositall from the Russian people. It is nearly as good as
Zerodur, at CTE=0.15ppm and much cheaper. You can budget on
about $5/cubic inch. I had a quote for 20" diameter by 1.8"
thick of standard quality and it came out around $2700, ground
edged and chamfered.

http://www.lzos.ru/en/mailform.htm

-- 

Best regards,
  Richard in the UK

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