Re: [ATM] Use of bearings in (static) mirror cells

[Ken Hunter <atm_ken_hunter@yahoo.com>]

If I may be so bold...

If you really have any angular movement of any size,
You already have larger problems than silicon adhesive
will give you as long as the adhesive has a reasonable
thickness. 

Think about it...

Is soft, pliable silicon going to deform hard glass
from a microscopic movement of the glass? I think not!
It'll most likely be the other way around.

I just did a stress test on my 26 inch mirror today
(supported horizontally on two opposite edges) and
found that it could easily support 20 pounds of weight
without observing a stress situation in the glass. If
you have a 20 pound pressure from a silicon pad as
part of your mirror mount, you have serious movement
of one pad in relation to the others and real serious
problems with the design of your mirror mount.

Ken Hunter



Ken Hunter


--- Bob May <bobmay@nethere.com> wrote:
> The ball joint with a teflon cup is a pretty low
> stiction joint.  The
> problem with the silicone joint is that if you
> really have any angular
> movement, the silicone pad will cause a stress on
> the glass which will
> perform a modification to the front surface of a
> significant size and, if
> the mirror is thin, you can very easily lose all of
> the supposed advantage
> of the support system.
> Bob May
> bobmay@nethere.com
> http://nav.to/bobmay
> http://bobmay.astronomy.net
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 


		
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