Re: ATM Active mirror figure correction?

[ScifiGuy <scifiguy@pacbell.net>]

I am by no means an authority, but on an intuitive level, it seems to me
that there would be an upper limit to the mirror size that would lend
itself well to a single tensioning bolt in the center for parabolizing.
For instance, a very large, thin mirror might deform in a manner that looks
more like a cone than a parabola.  It would be interesting to see a program
such as PLOP for simulating tensioning bolt arrays affixed to the backs of
thin mirrors.

--Mike Selfridge

At 07:46 PM 7/26/99 -0400, you wrote:
>
>Lawrence,
>
>
>There was an article in S&T in the early '90s about a guy, who amongst
>other things, had a 6" mirror he glued a bolt to in the middle, supported
>the rim with carpet, and tuned his way to a good figure by adjusting the
>tension on the mirror by turning the nut on the bolt. I guess if it can be
>done on a 6", it can be done on your 13"...
>       Dunno what kind of glue he used or the specific issue of S&T, but
>it has been done...
>
>Dave
>
>
>_________________________________________
>"All of my houseplants are Y2K compliant"
>