[ATM] Cell design and collimation stress

[lkory at worldnet.att.net (Joe)]

 On Saturday 07 February 2004 02:53 pm, Mel Bartels wrote:
> I've experimented with bending forces in thin plate and pyrex large blanks.
> I've found that a differential pressure of 1 ounce can be detected.  One
> pound of differential force makes a horrendous change in the wavefront.

Any findings or comments on collimation bolt location and bending forces on the mirror.  More specifically, in some designs the bolt presses directly on the flotation system via the support triangles(for reference see Kriege) while in other designs the mirror moves as a result of the bolt pressing only on the cell frame and thus perhaps more indirectly on  suspension points(Sayre, Gray etc,).  From Mel's findings it would seem that pressure directed upward via the triangles would exert more detrimental stress on the mirror than just tilting the entire cell.  
Joe