Re: [ATM] 20incher with segmented and ribbed mirror at 12Kg

["Andreas Derwahl" <andreas@duda-derwahl.de>]

> Well, if nothing worse, the print through will act like an elaborate
> secondary holder...

The diffraction spikes might be a bit on the heavy side, though...

>From that perspective: if you can't avoid print through completely a support
structure from cut up glass tube (like hollow glass columns) would probably
be favourable as the diffraction "spikes" would spread out.

I remember Richard Schwartz mentioning problems with thermal stress up to
the point of breakage if heat transfer between front and back plate is too
small. Apparently that wasn't a problem with Willems mirror, so maybe the
glue joints are flexible enough to accomodate for thermal stress. This could
also contradict neccessary dimensional stability but I imagine 2 mm glass
thickness for the support structure will also yield a quite flexible
arrangement.

Andreas

PS: Ric's link has a surplus w, once removed it works fine. Thanks to
Richard for pointing that out.

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