[ATM] ball bearings for triangles

[Jay Kirkland <jaykirk2@compusmart.ab.ca>]

	Realized after my "stainless freezing"  post that in the last paragraph I
had posted a reply to the wrong thread. 
	But the more I think about what mirror cells are supposed to do, the less
sense having to counterbalance triangles makes to me. If you think about a
mirror cell from the wrong direction, instead of supporting 1/27 of the
mirror but supporting 1/3 of itself at a time, it HAS to balance. Even if
the triangles are odd shapes, in the rare instances when the cell
components are directional, if the components aren't balancing themselves,
they're not going to be supporting an equal amount of what's above. 
	On my 20"s 27 point cell, the triangles are Kriege/Berry's design, with
the 1/2" border around the points. The points were PLOP derived. I made the
triangles to close but not nearly exact tolerances, say +/-1/8". I put the
4 points on each triangle as exactly as I could, maybe +/- 1-2mm. I'm no
kind of metal worker at all but that wasn't difficult. 
	So I come back to my earlier thought: If your cell has been assembled with
a reasonable amount of care and the cell components are still out of
balance to such an extent that you need to add or remove weight to make
them balance, then there has to be something wrong with the cell design
itself. The points just can't be supporting the same amount of mirror in
such a situation. 

Jay


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