Re: ATM Active mirror figure correction?

["Frank" <thewards@mindspring.com>]

Larry,

I don't remember the URL but there's a web page on "Weird Scopes"
that includes one designer's Yolo with a warping harness consisting of
a 1/4 20 bolt and a piece of carpet.  He does what you are discussing
to get a toridal shape.  Maybe someone can remember the site and
lead you to it for all the info you need.


Frank Ward
Atlanta, GA
-----Original Message-----
From: Lawrence Sayre <lsayre@stratos.net>
To: ATM <atm@shore.net>
Date: Monday, July 26, 1999 6:22 PM
Subject: ATM Active mirror figure correction?


>
>I own a 3/4" thick plate glass Coulter mirror (13.1" dia.) which has a
>smooth figure, but is under corrected.  This is quite evident via the
>star test method, and was confirmed by Steve Swayze.
>
>Is it possible to glue a small "swivel level" pad onto the dead center
>of the back side of this mirror (using an appropriate glue, such as the
>glue used to adhere the rear view mirror to a windshield), and then pass
>the swivel level bolt through the back side of the cell (where it would
>be as accessible as the three collimation bolts), and then torque a nut
>on the swivel level bolt to literally pull this thin plate glass mirror
>into a good parabolic curve?  Or would this induce loads of stress
>related astigmatism, or worse, shatter the mirror?  The mirror cost less
>than the fix (re-figuring), so I'm willing to attempt this if it sounds
>possible.
>
>PS: If this is possible, what glue should I use?
>
>Lawrence Sayre