Re: [ATM] ritchey cretians, fused quartz

["kreig" <astroguy@nas.com>]

Mikhail,

ATM's have always been interested in making up their own cast blanks, either 
as flat slabs, slumped or molded.  So your work is certainly of interest to 
those here on the list. As long as you are discussing "how to", "what not to 
do" etc, we will be of interest.  If your work ultimately forms into a 
business or company, we cna wish you the best of luck.  As an example, if 
Newport Glass started posting information about processes involved in almost 
anything related to glass, we would, again be very interested as long as 
there is no promotion of products.

Please keep us informed about your successes and failures and good luck.

Kreig




----- Original Message ----- 
From: "Khail Rosenberg" <mikhail.rosenberg@rosenbergtelescopes.com>
To: "Francis J. O'Reilly" <foreilly@bestweb.net>
Cc: <atm@atmlist.net>
Sent: Friday, January 18, 2008 10:43 AM
Subject: Re: [ATM] ritchey cretians


> Greetings Francis! and all!
>
> I am very concerned about advertising here,(and only wish to follow rules)
> and will be happy to answer any questions.
>
> as for the quartz question: it is a fused silica piece, but lately I have
> had trouble with the last 4 in my batch... I have 10-30 bubbles, all small
> but will possibly anger an astronomer such as me.. garbage. I have heard
> Raise the temp! let it heat longer!!! but really i am at a loss now, i did
> that and then the quartz started changing properties, turned to a false
> color, and simply got ugly. I wanted to stay away from pyrex, due to my 
> love
> of quartz for many reasons, but now I am all quartz, zerodur, or plate...
>
> pyrex is almost a dream to work with, but like everything in my head once
> something has a lot of hype there has to be a draw back (maybe not...) but
> pyrex I can make sheets to 48" and 5"(almost) no problem... compared to
> quartz.
>
> What I am really looking for in this group is a quasi partner... someone
> that built a 10-20 inch RC, and can assist getting me through my 48" 
> initial
> and once that is done hopefully move to bigger and better things. in 
> return
> they can get telescope goodies at non-astronomical rates.. that or i would
> be happy to give frames, glass anything really for assistance.
>
> I hope my comments are ok for the board, I am really looking for help in
> this exciting venture.
>
> I appreciate all comments and suggestions from everyone, and if anyone 
> needs
> help with supplies i can give a good suggestion ;)
> Thanks!
> Mikhail
>
> On 1/18/08, Francis J. O'Reilly <foreilly@bestweb.net> wrote:
>>
>> Mikhail,
>>
>> Welcome to the list!
>>
>> We were discussing the 32 inch blanks that you were selling on eBay a
>> couple
>> of weeks ago. There was some debate as to whether they were individually
>> cast or cut off a "log" of fused silica.
>>
>> I am still considering whether I should buy one.
>>
>> Stay in touch with all of us. Your questions and contributions will be
>> welcome.
>>
>> Francis J. O'Reilly
>>
>>
>>
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