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Re: [ATM] 40" mirror some ideas
Like this ?
http://www.cablevision.qc.ca/astro/alex-36ins.jpg
36" dia. x 5" thick, 120 lbs, faceplate to f/4.5, flat back, homemade.
Jean-Guy Moreau
----- Original Message -----
From: <vorblesnak@peak.org>
> Keeping in mind the original discussion. Why not a two stage approach.
> Cast the front as a 2" x 40" disk of pyrex. Then create a cellular blank
> by fusing ribs and a back to the pyrex front. The front will weigh less,
> cool and anneal easier, generally be a better disk to work. Then you
> could pick up the thickness needed to combat flex by fusing a structure to
> the back. Do it right and you could slump it to the right curve and save
> on grit and back muscles.
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