RE: ATM 12 point mirror cell - examples

["Dwight K. Elvey" <dwightk.elvey@amd.com>]

Hi Shawn
 Three points defines a plane, 4 may not. All of
the fixed pieces need to be either 2 point ( a line on
the plane ) or three ( the plane ). Four would put
unequal pressure on two of the points, if there was
just a slight difference in the surface, on the back
of the mirror or in the heights of the support points.
Dwight


>From: "McHatten, Shawn" <Shawn.McHatten@aliant.ca>
>
>Hey Tom
>	Umm? I don't understand. Why must the platforms be three points (or 
triangular). This 12 point designs looks perfect for three squashed 
diamonds. Each made up of three outer ring points and one of the inner ring 
points. Collimation bolts go in the middle of each of the diamonds. 
>	Hmmm?? Now I got something ELSE!! to read up on :). I obviously 
don't understand mirror cell design :).
>Shawn
>
>-----Original Message-----
>From: tkrajci@san.osd.mil [mailto:tkrajci@san.osd.mil] 
>Sent: Friday, December 13, 2002 11:42 AM
>To: atm@shore.net
>Subject: ATM 12 point mirror cell - examples
>
>
>I've updated my web page at:
>http://overton.tamu.edu/aset/krajci/
>specifically
>http://overton.tamu.edu/aset/krajci/cell-12-pt/cell-12-pt.htm
>
>Please let me know if I'm correctly laying out some useful, general design 
>principles.  
>
>Here's the $64 question - which of my two versions is better...or are they 
>equivalent?
>
>Thanks in advance,
>Tom Krajci
>Tashkent, Uzbekistan
>
>PS.  I'm still digesting stuff on compliant hinges, main mirror focusing, 
>etc.  Once I get firmer ideas about it I'll post them.
>
>
>
>