Re: ATM 1/2" plate glass

[Ryan Hess <atmryan@excite.com>]

Hi,

I'm making a 10" mirror from a 5/8" blank, and there isn't any problem so
far...  I could say the largest size would be a 14".  That would probably be
when you run into **BAD** sagging.  Of course, I'm assuming you have a
superb mirror cell all laid out...  Don't go with superglue or epoxy.  If
necessary, use optical cement.  Still though, warping would be nasty...  see
if you can have it done by Newport Glass.  Hope this helps,


On Wed, 20 Sep 2000 07:51:08 -0400, natsp wrote:

>  
>  what is the largest mirror ever made from 1/2 plate, that worked.
>  and for you expansion coefficiant people out there.
>  what glue would have the closest
>  expansion to glass.
>  i want to bond 2 -1/2"blanks together,
>  for a 1" blank, how about superglue?
>  or epoxy.
>  stan
>  
>  


Ryan Hess
Fellow ATM'er & Astrophotographer
----------------------------------------------------
Sky Object Software's Website: <http://www.tcfb.com/skyobj>
"You know you are addicted to amateur astronomy when your telescope weighs
more than you do!"





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