Re: [ATM] Was cellular, now Fused Silica

[William Marriott <bmarriott@pacbell.net>]

Richard;

Yes, I guess that would help.

How about

508mm diameter, 38mm thick fused silica
RC=4266mm, no central hole

Thanks!

Bill Marriott
VA Optical Lab




--- Richard <cnc@cncservo.co.uk> wrote:

> Hi William,
> 
> Monday, June 18, 2007, 6:43:06 PM, you wrote:
> 
> WM> Hello;
> 
> WM> So, in my search for glass for an 18"-20" mirror
> WM> blank, I have come upon an interesting piece of
> glass.
> WM>  It is a 20" diameter piece of fused silica,
> but, it
> WM> is only about 1.5" thick. 
> 
> That's thicker than the 20" Pyrex blanks a bunch of
> us are building
> scopes with at the moment Bill. I used Plop to
> design an 18 point cell
> for mine. There are plenty of people here who can
> drive Plop who will
> help you, but we need to know radius of curvature of
> the finished
> primary, central hole size and central obstruction
> (if any).
> 
> If you have a chance of that slab at a reasonable
> price, I'd grab it. A
> bit thick though ;).
> 
> -- 
> 
> Best regards,
>   Richard in the UK
> 
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