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

["Arjan te Marvelde" <arjan.te.marvelde@hetnet.nl>]

Hi Nils Olof,

> Sorry, I don't see the mis-understanding here. Surely they work (just
> as "floating" supports do) by supporting the mirror's weight in such a
> way as to - if not prevent, at least minimize - mirror deformation.

Of course the mirror weight has to be supported by the cell, but what Mel
points at is that the mechanism is essentially different.

Each astatic support asserts a force to the mirror, which is only determined
by the lever and its counterweight, and not by the mirrors' weight. If you
would have astatic supports only, they'd have to be tuned so that the sum of
their forces cancels the force caused by the mirror weight. Otherwise the
force imbalance will make the mirror move until it hits some non-linearity.
This is obviously hard to realize, so usually there will be three fixed
supports that take the residual mirror weight and hence also fix the
mirrors' position.

Arjan


_______________________________________________
ATM mailing list http://www.atmlist.net/