Re: [ATM] Mirror cell design

["Nils Olof Carlin" <nilsolof.carlin@telia.com>]

Wouter,

> I haven't made up my mind yet if I want to build a dob or equ scope and
> one of the desiding factors will be the primary mirror cell. Would
> anyone know how to modify the Kriege and Berry design so it will support
> a large thin mirror in an equ scope? Would replacing the sling with e.g.
> a ring or plugs like on this page
>
> http://www.focuser.com/atm/spltring/cell.html
>
> be enough? I suppose the flotation system is symmetric enough not to
> require any modifications. Is this true?

The flotation cell, whether by Kriege/Berry or further refined with Plop,
won't be a real problem. The plugs on that page may work for a really thick
mirror, but not likely for a thin one.

The best solution *I* can think of is here:

http://w1.411.telia.com/~u41105032/sling/threepart.htm

- it ought to work up to a maximum tube/cell rotation of +-45 deg from
neutral - I leave it to you to figure out if that would leave any part of
the sky inaccessible to you (if so, you could perhaps extend the 90 deg
elements to 120 deg and overlapping, giving you +-60 deg - perhaps worth
thinking of a bit more). But I haven't actually tried it on an eq mount, so
I can't make any promises.

Nils Olof


>
> Thanks in advance!
>
> Wouter van Reeven
>
> --
>
> Black holes are where God is dividing by zero.
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>

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