From: "Dwight K. Elvey" 
To: atm{at}shore.net
Reply-To: "Dwight K. Elvey" 


>From: tkrajci{at}san.osd.mil
>
>>From: "Dwight K. Elvey" 
>
>>http://overton.tamu.edu/aset/krajci/cell-12-pt/cell-12-pt.htm
>
>>...No one said you had to make the long springy thing.
>>The actual support triangle can even be a circle of metal
>>with the three points....
>
>The other issue at play here is that skinny triangular supports demand
>careful/accurate calculation of the balance point, and then proper
>fabrication/location of the hinge/pivot.  If you don't do that...you won't
>have the desired balance forces on the support points and your mirror's
shape
>will suffer.
>
>This is why it is a good idea to have your triangular support points
arranged
>in a more 'equilateral' manner if at all possible.
>
>Tom Krajci
>Tashkent, Uzbekistan

Hi Tom
 If you make them out of disk, you can counter balance each
of the mirror support pins by another one across the center pivot. The main
support pivot can then be center of the disk, even though it might not be
the center of the supports pins. These counter balance pins would point
away from the mirror. You don't need to do any calculations as the entire
system is balanced. Of course, there are other ways to skin the same cat.
Dwight

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