[ATM] 40" mirror some ideas

[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.

David Davis
Toledo, OR  97391

>6x the weight of that 20" x 2" is 300 pounds. and a 8 inch x 40 inch primary
>would cost more money that I have had at one time in my entire life. The
>cost of the alterations would probably double that.
>But I could probably cast it as a honeycomb with those specs, couldn't I?
>
>Clear skies, Jerry

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