Re: [ATM] RE: Glued mirrors?

[Jarvis Krumbein <jkoptic@juno.com>]

Before you charge off to do a mirror with a Hextek blank, you might want
to check with John Vogt about "print through and astigmatism" problems. 
John has done a couple of 32" Hextek mirrors which have been prize
winners at Stellafane and spent a lot of time conquering the problems
mentioned.

Jarvis Krumbein,  jkoptic@juno.com

On Thu, 23 Sep 2004 16:48:47 -0400 "Jean-Guy Moreau"
<jgmoreau@cablevision.qc.ca> writes:
> Hello Bob, count me in  ;o)
> 
> see 
> 
> http://www.cablevision.qc.ca/astro/alex-36ins.jpg
> 
> 
> 36" dia and 5" thick, 120 pounds of fully fused, strain free glass,
> f/4 molded faceplate, 5/8" thick, flat 1/2" back (seen in photo)
> can be polished/figured without printrough or astigmatism
> 
> fusing is the way to go !
> 
> Jean-Guy Moreau
> Quebec
> 
> 
> 
> ----- Original Message ----- 
> From: "Bob May" <bobmay@nethere.com>
> 
> > Gluing glass together will be an exercise in frustration all along 
> the way.
> > Better to fuse the glass together and slump it at the same time.  
> There are
> > several people that have been doing fused blanks, our imitible 
> Richard
> > Schwartz being one of them as well as another person who I don't 
> remember
> > his name at the moment, to get volume without the weight of the 
> solid glass
> > mirror.  Probably the best in this regard is the HexTek mirrors of 
> Bob Goff
> > with which a 30" mirror can be picked up by a single individual 
> without any
> > problems but the ungainlyness of the size of the object.
> > I'll also note that the BVC blanks appear to be fused glass.
> > Bob May
> > http://nav.to/bobmay
> > bobmay@nethere.com
> > NEW! http://bobmay.astronomy.net
> > 
> > 
> > _______________________________________________
> > ATM mailing list http://www.atmlist.net/
> >
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> 
> 

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