[ATM] Re: Second Thoughts on Mirror Support

[mbartels at bbastrodesigns.com (Mel Bartels)]

> > be 12/3 or 4 pounds times 1.75 inches which is 7 in-lbs.  This is
resisted
> > by the two RTV pads that in the worst case are only 2 inches apart.
This
> > puts a 3.5 pound force into the mirror and another 3.5 pound force just
2
> > inches away in the opposite direction.  That seems like a lot of bending

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.

Mel Bartels