Re: [ATM] Re: Figuring the little dinky sphere

["David Harbour" <scarab2@cox.net>]

Alfredo,

I think Richard's last reply, and my addendums, probably constitute the best
advice you can get. I think that a null test is a test that let's a guy off
very easily; I am wondering, though, if on optics that small, there might
not be polishing routines that will "automatically" yield the required
figure.

For instance, I remember the technique of mounting several blanks in a
matrix, and grinding and polishing them flat. This usually works very well;
you are not trying to treat a single small mirror, but essentially, a single
large mirror (whose pieces you later "break out" and have several finished
elements). Perhaps something like this might be the answer to you guys
trying to make these dinky spherical mirrors: mount a bunch of them in  a
matrix of dental stone, or whatever, and grind a "big" sphere; then, "bust
'em out" after they're done. I don't know. Look at all the late posts.
Thanks for seeking my wisdom (which is pretty limited, I promise you)-

Dave

P.S.- I think you are on the right track, Alfredo. "Keep on 'a truckin'"-


----- Original Message ----- 
From: <aneves@snowsoft.biz>
To: <atm@atmlist.net>
Sent: Wednesday, June 15, 2005 1:35 PM
Subject: [ATM] Re: Figuring the little dinky sphere


Hi David,

Please consider that I am trying to do the same as Richard but on a 1.25"
negative meniscus. So far I have been using the beam splitter and a ronchi
screen to figure my refrence element 2 sides!

Regards,

Alfredo


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