To: Robert Fifarek 
Cc: atm{at}shore.net, owner-atm{at}shore.net
From: Hugues.Laroche{at}ses-astra.com
Reply-To: Hugues.Laroche{at}ses-astra.com



Hi Rob,

>So now after grinding for two years, I have
>a very nice plate grass f4.1, 16" dimater mirror
>attached to a concrete base pitch lap (about
>40% contact) and pondering my chances of  ever
>realizing its completion. Any ideas?

May try to heat the conglomerate on an electric plate, having the concrete
part on the heat source. Heat gently, and the concrete might not shatter.
At some point the pitch will have to soften very much at the interface with
the concrete. OK, this destroys your lap of course, since afterwards you
have to take off the pitch from the glass (expose it, inclined, to the
sun?) and clean the glass gently with a solvent. I did that once, with a
8x1.5" concrete base, IIRC. Now if your concrete is very thick this
might not work without destroying the concrete too. :-(

Would say that is the last method, if nothing else works... Good luck!

Hugues




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