Re: [ATM] Flat lap foundations

[=?Windows-1250?Q?Attila_Schn=E9?= <yolo@chello.hu>]

Monday, January 23, 2006, 5:30:05 PM, you wrote:

ML> Tony,

ML> Tony Gondola wrote:
>> Is it permissible to use a flat substrate for a pitch lap on mirrors of
>> moderate to long f ratio?

ML> No problem.  I wouldn't worry about unless your lap is bigger than 16"
ML> or faster than F/4.  Just make the pitch a bit thicker.

ML> I use flat substrates all the time.

ML>         Mike Lockwood

ML> _______________________________________________
ML> ATM mailing list http://www.atmlist.net/

Hi !

My experience shown that, if the focal ration is fast like f/5 and the
mirror diam. is about 10" or bigger. Than it is more difficult to
press the mirror in the pich, and you need more pitch, when you use
flat substrate. That's all,
otherwise you can use it if once the tool is ready.  Actually my
friend uses always flat substrates. If you need to regringd, than you
don't need to scrub away the pich from the tool.

-- 
Üdv:
Attila Schné
                          mailto:yolo@chello.hu

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