Re: ATM Advice with Flexing a 16"

["David M. Bourgeois" <dbourgeo@thezone.net>]

You might be right there, but it seems to me to be overkill with standard
glass (1:6). However, with a concave spherical back its definitely going to
have to be supported somehow. I was thinking of making a plaster tool, grind
the back with that, and then use the tool to support. This would mean two
tools, one for the front and one for the back. (Actually, I would do most of
the grunt work with a hand rig for a diamond saw blade, and THEN make a tool
for the back.  No power tools available to me. See previous posts by Suzy
Jackson on that topic.)

I would appreciate feedback from someone who has taken this route (concave
back + dewedging). Failing that, I'll try my best....

On Sat, Jan 18, 2003 at 05:16:33PM +0100, Vladimir Galogaza wrote:
> According to the recent postings* to the list it seems that the best way to
> support the
> mirror for grinding , polishing and testing is to support it in its
> flotation cell.
> Everything else is more or less good approximation giving usually good
> results but sometimes causing  unexplained ( unexpected) problems.
> ( The thinner the mirror the more pronounced are support problems.)
> 
> 
> I would appreciate very much list opinion and comments  on this.
> 
> *  Martti Koskimo, James Burrows and many other.
> 
> Regards
> Vladimir.
-- 
David Bourgeois  -->dbourgeo@thezone.net
http://home.thezone.net/~dbourgeo/
#  "Research is what I am doing when I don't know what I am doing." 
#  - Wernher von Braun