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

[Dale Eason <atmpob@yahoo.com>]

Jerry from many of your posts you seem to be concerned
about the mirror dropping out of its cell.  If you are
designing a dob then the Krieg and Berry Cell with the
three mirror keepers works just fine.  They dont touch
the mirror but keep if from falling forward and out of
the cell when tilted past horizontal.  They are like
mirror clips that don't touch the mirror.

A similar arrangement with proper lateral support will
also work for EQ type mounts I think.

Dale

--- Jerry <wa4guu@verizon.net> wrote:
> I had thought of something similar. But I couldn't
> picture that not to be a
> form of edge support. The only difference is that it
> is an inside edge
> support. And to my thinking the gimbals are
> superfluous as the edge support
> negates the "Marvelde Force Couple". 
> 
> I had also thought of just drilling a hole in the
> center and putting a
> retaining bolt through the middle. Not Richard
> Schwartz tight. Just tight
> enough to prevent mirror drop out. Desparate, huh? 
> 
> 
> 
> -----Original Message-----
> From: Ken Hunter 
> I imagine a Plop or otherwise designed cell glued
> with
> RTV as is normal but with additional support
> installed
> as follows.
> 
> Perforate the mirror and add a counterweight that
> applies side (locating) pressure to the mirror at
> the
> COG by virtue of a gimballed pivot in front of the
> cell face with the counterweight hanging behind. The
> lateral force (referenced to the glass) would be
> applied through a rubber O'Ring at the COG and
> "INSIDE" the mirror itself to eliminate the
> distorting
> forces from the point contacts being offset from the
> COG.
> 
>  
> 
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 

__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 
_______________________________________________
ATM mailing list http://www.atmlist.net/