Re: [ATM] The 15.5 Ultrathin Project

[vorblesnak@peak.org]

What I have found is the shape of the glass has as much to do with the
rigidity as the thickness; maybe more.  The curved shape adds strength to
the final mirror.  There will of course be a low end at which even the
shape won't help, but that is what I am chasing now.  Still, the glass is
very lite weight and the curve will support much.

Support in use is far more critical but if the mirror is floated on soft
points it will work.  I take a measurement from the table top to the edge
of the mirror and that is the thickness I use in PLOP to figure the point
placement.

David Davis
Toledo, Oregon 97391

>
>
> --- vorblesnak@peak.org wrote:
>
>> I snapped a photo of the mirror with three hours of
>> grinding on it.  It is
>> at ..
>>
>
>  How do you manage to test the mirror given the
> flexiness of the thin glass if put upright on a test
> stand?
>
> Ric
>
>
>
>
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