Re: ATM Re:6:1 Flexture

[btk@ix.netcom.com (Bill Marriott )]

You wrote: 
>
>
>>Print through is a real thing. It comes of having too great a
>>span from rib
>>( or member ) to member, flexing under the pressure of the
>>polishing. The parts over the ribs are supported against
>>flexture and are polished off, yeilding an apparent low over
>>the rib.
>
>Couldn't this problem be fixed by having the ribs form a
>hexagonal pattern?  This would keep the ribs all virtually
>unchanged during slumping, fusing and polishing, thereby
>reducing print through. It should also reduce flexure in the
>system...
>
>Just a thought from somebody who does not know whether
>this would work or not.
>
>>Aaaaahhhh. And then there is Hextek.
>Even with a Hextek mirror, the thin, unsupported portions of the
>faceplate
>still deflect under polishing pressures. There are barometric ways to
>keep
>the faceplate from sagging in a Hextek piece
>But there are still spans. These spans are why there are 18 point
>suspension
>systems, etc.
>Bob
>
>

I recently recieved a brochure at work from Corning, showing their ULE
(ulta low expansion) glass products, including an impressive 8.1 meter 
mirror, achieving significant weight reduction, using hexagonal
interior structure.

Amazing stuff

Bill Marriott
btk@ix.netcom.com