Re: [ATM] Mirror cell design

["Richard Schwartz" <richas@earthlink.net>]

The most popular alternative to a sling is to use metal clips at the edge
of the mirror to retain it in the cell.   If you screw those clips tight
enough, friction will prevent the glass from sliding around or rattling in
the cell during transport, and your scope will always be perfectly
colimated.

Whatever you do, you do not want to search the ATM list archives for any
discussion of this.   Some crazy radicals advocate GLUING THE MIRROR INTO
THE CELL.   If that were a good idea, the optical great masters of the
1930's (such as John Hindle) would have discovered and used that method.  
Any fool can see that if you glue the glass into the mirror cell it will be
under a lot of stress when the temperature changes and the figure will be
ruined.

. . . Richard

> [Original Message]
> From: Jeff Anderson-Lee <jonah@cs.berkeley.edu>
> To: AMT Mailinglist <atm@atmlist.net>
> Date: 7/20/2004 8:30:56 AM
> Subject: Re: [ATM] Mirror cell design
>
> Wouter van Reeven wrote:
>
> >So, is there an alternative to using slings? I suppose creating a ring
> >around the mirror would not leave enough room for the mirror to expand
> >under heat, right? How about putting a rubber ring inside a metal ring?
> >Wouldn't that give enough support and not too much friction
> >
> A rubber ring would add an incredible amount of friction. You could try 
> wrapping the mirror with a few wraps of teflon plumber's tape perhaps.
>
> Jeff
>
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