Re: [ATM] Ultra-Thin Edge SupportIdea-RE:[atm_free]ULTRA-THIN30"mirror from Hong Kong

["James Lerch" <jlerch1@tampabay.rr.com>]

CS> I posted a link to a picture of such a cell but the link was truncated, so
CS> let's see if this works:  http://tinyurl.com/acww5
CS> Here is one for a 36": http://tinyurl.com/df6vq

Asides from the fact I still don't see how an astatic support is superior to a 
whiffle tree support, I've always wondered "How do they keep it collimated?"

Astatic = not static = something moves = And / Or combinations of 
friction,stiction, hysteresis, oscillation

If the system is disturbed, what guarantees it will return to its starting 
position?

I gather the idea behind an astatic cell is the weight of the mirror presses on 
a lever.  The lever attempts to pivot around a hinge.  This attempts to move an 
equal mass an opposite direction.  With the hope being that the forces cancel. 
As I see it a whiffle tree does the same thing, but with less parts...

Take Care,
James Lerch
http://lerch.no-ip.com/atm (My telescope construction,testing, and coating site)
http://lerch.no-ip.com/ChangFa_Gen (My 15KW generator project)

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