Re: [ATM] reducing mirror weight by sandblasting

[buck childers <bchilders@everestkc.net>]

----- Original Message ----- 
From: "Dan Feldkhun" <glasspusher@mindswell.com>
<snip>
> >Dan you might want to discuss with Richard Swartz and his effort in
> >making lightweight "ribbed" mirrors.  If I recall correctly he had
> >"print through" issues during grinding/polishing due to the ribs that
I
> >think would also hamper your efforts.
>
> I've heard this from several people.  I wonder how thin the mirror was
in
> the gaps to see this effect.  I really should chat with Richard.
<bigsnip>
> -- could the "print through" effect be caused by different parts of
the mirror

Dan,
Regarding print-through; Taking a break from his battles with argentine
ants and such, Richard left me an email off-list indicating that his
ribbed blank print-through was limited and negligible with proper design
of the ribs and grinding/polishing technique.
-Buck

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