From: "Bob May" 
To: "atmlist" 
Reply-To: "Bob May" 


All you need behind the mirror for a 3 point cell is a 1/4" aluminum
(or steel for a larger mirror) and a few thousandths of an inch to insure
that the mirror isn't touching the cell itself.  The rest of the mechanism
can be on the side of the mirror if so desired to the point where nothing
else extends below the back of the mirror.  1/4-20 screws are quite big
enough to do the collimation and those can be had with 3/8" or so
diameter heads (Allen socket screws or even turned down Fillister head
screws) to minimize the required size.  I could probably put together a
full cell that still fits in a 1" larger diameter tube than the mirror
is.  If I was able to use a square box instead, there would be all kinds of
room to do a orthagonal system with a spring or other holding mechanism  to
hold it together.  Bug me and you may get a quick drawing of how to do the
job. Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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