[ATM] Friction and sticking in multipoint mounts

["lou krajci" <loukrajci@comcast.net>]

>From: artbianconi@blast.net

>I've buddies that worked as machinists in the prototype shop for
>Bell Labs where exotic designs are (were?) common place....

>When I showed them a typical 27 point mount and tell them what is
>expected, they roll their eyes. They hear ". . . to 1/12th wave
>accuracy"  and they look at me as if I am crazy!

>There HAS to be a better way!

I propose use of compliant hinges in mirror cells.  See:
http://overton.tamu.edu/aset/krajci/scope-design.htm (very bottom of page,
titled "Main Mirror Cell - sloppy moving parts"
then:
http://overton.tamu.edu/aset/krajci/cell-bearing.htm to introduce idea of
compliant hinges
then:
http://overton.tamu.edu/aset/krajci/cell-12-pt/cross-hinge.htm (and all
other related links on these pages)

Also see my long post from a few hours ago on mirror cells with bipods for
lateral support and compliant hinges in the axial support.

Please approach your machinist buddies with these ideas and get their
feedback.  I'd love to improve designs based on their valuable experience.
(Considering the wealth of knowledge they represent...you should be asking
them for ideas much more often than you ask for ideas from a bunch of
amateur hacks on email lists that make mirror cells with hand saws and duct
tape. ;-)

Thanks in advance.

Tom Krajci
Albuquerque, New Mexico

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