Re: [ATM] UltraThin support investigation

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

Dale,

what may help is linear bearings - use the cylindrical pegs but make them 
roll freely in the direction parallel to the mirror's optical axis (one way 
might be supporting each peg with 4 ball bearings much as the drawtube of a 
Crayford focuser). This would compensate for the edge not being even and/or 
cylindrical, but not for the offset from the COG - but would any support?

Nils Olof

> ....We think the astig is induced primarily by
> the lateral supports. They can not support it at its
> COG because the mirror is slumped into a bowl shape.
> We think that because it is aligned and high with one
> of the pegs at random times.
>
> Bottom line is you move the mirror and the support
> changes in terrible ways.
>
> I wish I could use roller bearings for the edge
> support but that is not possible since the edge is so
> thin.  It would also not be on the COG but so it is
> with the pegs.


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