[ATM] Best locations for 4-Pt. Wiffletree edge support PLS.

["Bob Drew" <gofast3@hotmail.com>]

Thanks everyone for their posts.

Mel,  I just  finished reading atmList?s related threads for almost the last 
6 year, particularly your posts.  Given your vast experience and 
acknowledged expertise, I would  certainly accept your conclusions about 
which authors? theories you personally are comfortable with.

Dale, I respect the collective knowledge of atmList members here and think 
it  is probably the best atm resource on the web. It?s members have always 
included guys on the leading edge of telescope design and construction.  
While some may push the limits and ?go boldly?? they?re also grounded in the 
sound engineering. And, just as important ? actual experience such as Andy 
Saulietis and his sling, etc designs for even bigger scopes.

Was surprised that my thread question lead to so much discussion and that 
edge control for thin amateur mirrors  is still a ?frontier? and hasn?t yet 
been the subject of  3D modeling or analysis, like back support has.  Too 
bad that the latest solutions adopted by high-budget observatory solutions 
using very complex active systems  don?t translate well for us atms.

Thanks for the links Dale, altho I already  like the expertise here.  I 
agree with you about the edge support working against the edge CG, adjusted 
because of the sagitta. And  that the edge support should move in 
conjunction with the cell.

Jan, if the edge mounts move with the live cell frame, would not there be 
very little movement. The only movement might be because of a different 
coefficient of expansion between the mirror material and the cell 
components,  and any change in orientation because of mechanical flexure of 
the cell frame.

Nils, you ask about the project.  We may use shoulder bolts as the pivot 
pins for the arms.  It will be treaded perpendicular to a sturdy riser 
welded to the ?live? or moveable cell frame.   Btw, there should be enough 
inside clearance in the mirror box for future mods.

Bob

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