Re: ATM 11.2" F/2 Primary testing questions :)

["AstroIdiot" <tgooch@arkwest.com>]

I have just begun dialouge with this man but I believe he must kmow what
he is doing. The 72" is being constructed for Harvard University. He also
has thousands invested in ovens and interferometers welding equip. etc
and has had a website http://www.stabilite.com/ for several years. The 65"
is indeed a celluar mirror with a strange and intricate pattern of fused
plates and links on the back. I believe the front to be 1" Pyrex slumped
and figured to approx correction. As I learn more I will post more.
Maybe a site with some pics.

Tommy


----- Original Message -----
From: "Bill & Lois Kelley" <wekelleylwk@sedona.net>
To: "AstroIdiot" <tgooch@arkwest.com>
Sent: Monday, December 31, 2001 10:22 PM
Subject: Re: ATM 11.2" F/2 Primary testing questions :)


> Tommy-
> Pardon me for butting in, but this was also posted to the ATM list and
> I couldn't resist. Since I worked with Alan Adler to develop flex, I
> decided to run a flex analysis on a 65" F2 mirror. I presumed it was
> not of cellular construction since when flexed the cellular shape prints
> through to the surface (and very badly so). I tried different thicknesses
> from 3" to 5", but couldn't get a figure better than 1/10th wave. At 5"
> thick the tension required was up in the many thousands of pounds and
> beyond the programs ability to calculate, allowable wedge was something
> less than 1/10,000th of an inch, and the gravity effect was above 200%.
>
> There must be something I am missing! ??
>
> Congratulations on your excellent new friends, and my best to you in
> the New Year.   Regards-  Bill Kelley
>
>
> ----- Original Message -----
> From: "AstroIdiot" <tgooch@arkwest.com>
> To: "Ric Rokosz" <radicell2@yahoo.com>; "James Lerch"
> <jlerch1@tampabay.rr.com>; <atm@shore.net>
> Sent: Monday, December 31, 2001 2:10 PM
> Subject: Re: ATM 11.2" F/2 Primary testing questions :)
>
>
> >
> > Talk about fast mirrors I'm excited. An old friend of Rick and Richard
> > moved his operation up the road from me. You may remember
> > Ray Demaris of Stabilite. I watched part of the construction of a 65"
> > F2 in front of his shop and he is also working on a 72" for a major
> > university. 72" (6 foot) glass disk is beautiful to behold. He is very
> > friendly and I'm going to try to pick up some tips and help on mirror
> > making. He slumps his faceplates and fuses the ribs in his oven (big
> > enough for even larger blanks) and has an interferometer setup large
> > enough to test these monsters.
> >
> > Tommy
> > P.S. The 65" is for personal use and is a sperical mirror that is flexed
> > into shape at the eyepiece. (I've hit the ATM motherload)
> >
> >
> > ----- Original Message -----
> > From: "Ric Rokosz" <radicell2@yahoo.com>
> > To: "James Lerch" <jlerch1@tampabay.rr.com>; <atm@shore.net>
> > Sent: Monday, December 31, 2001 9:15 AM
> > Subject: Re: ATM 11.2" F/2 Primary testing questions :)
> >
> >
> > >
> > > ---
> > > Ric
> > > Toronto,CDN
> > >
> > > __________________________________________________
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> >
> >
>
>