Re: [ATM] The Flexed mirror

["Mitchell R" <funnybone101@embarqmail.com>]

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Russell Jocoy
Sent: Tuesday, January 15, 2008 9:03 PM
To: ATM list
Subject: [ATM] The Flexed mirror


To all on the list,  Flexed mirrors have been discussed on this list for
many years. Many have found the process works very well. Others have proven
their accuracy to "correct" beyond the visual satisfaction... This is great
to not have to Parabolize the surface from a sphere...
    As Bob May mentioned, and which was brought up on this list years ago,
was to flex the polished, spherical mirror the opposite way and polish a
"new sphere" on the surface, then "un-flex"  In theory you would have the
classic Parob..  Has anyone attempted this??
       I also recall sectional heating in the center while polishing
"spherically" and then cooling to norm. to imitate the "dig"....Are we
getting to deep here??    Russ


****
http://www.digilife.be/club/johan.vanbeselaere/atm/optics/figuring/thermally
.htm

	Here is parabolizing by heat/cooling. I read through it some time
ago and it would seem you need to control the heat carefully; easier to
parabolize with traditional strokes in my opinion.

	Flexing then polishing in a new sphere actually sounds like an
interesting idea. You would have to hold to shape closely under the pressure
of polishing though. 
	
	I wouldn't be able to decide if traditional parabolizing vs. flex
then polish a sphere then release would be easier till I make larger mirrors
and get the hang of it, and of course till someone tries to flex the polish
it and see if they can overcome the carious obstacles. 

Mitch
 

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