RE: [ATM] Mirror Cells

["Peter" <peter@kitgear.com>]

Don,

This photo is difficult to see what you're pointing to. Do you have any
other photos of your compliant hinges?

Thanks,

Peter

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net]On Behalf
Of Don Clement
Sent: Sunday, January 02, 2005 4:31 PM
To: atm@atmlist.net
Subject: Re: [ATM] Mirror Cells



Home shop practical machined tolerances on the order of 0.001"doesn't mean
that mechanisms can't be built in the home shop that are capable of smooth
movement and resolution down to 0.000001"or less. It is possible to build,
in the home shop, simple structures with this type of resolution using
compliant mechanisms. A good example of a compliant adjustment mechanism
with mico-inch resolution is the bowed flexure. Here is an example of an
all-compliant (stiction-free) single stage bowed flexure:

http://photobucket.com/albums/v332/DClement/?action=view&current=BowedFlexur
e.jpg
Additional bowed flexure stages will yield even better resolution. I see no
reason why a compliant, stiction-free mirror cell that could compensate for
thermal and positional changes to the mirror could not be built in a home
shop.



Don Clement

Running Springs, California





> The front of the mirror should not be bent more than about 5-10 nanometers
from
> the ideal parabola for high resolution observing.  That is 5-10 billionths
of a
> meter or 5-10 millionths of a millimeter or about 0.0000002 to 0.0000004
inch.
>
> Ordinary machine work, as practiced in home workshops is doing well to
hold
> 0.001 inch tolerances in routine work and flexure is noticible in most
> mechanical assemblies at that level.  Ask a machinist about setting up a
lathe.

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