[ATM] WG: Fused Quartz Blank

["Jerry" <jroyston@gmx.de>]

Hello all,
	The last mirror I made was a 10" f/6, about 1.5" thick, quarz. It's
very tough, and takes a good polish. It took three evenings to rough grind
it with #60 SiC. Due to the thermal stability and good conductivity it's
much better to figure than Pyrex.
I wouldn't hesitate to make another quarz mirror - though you'll need to
take some care with such a thin blank

Best wishes, Jerry  

-----Ursprüngliche Nachricht-----
Von: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] Im Auftrag von
Virgil.Johnson
Gesendet: Mittwoch, 3. Oktober 2007 21:03
An: atm@atmlist.net; vorblesnak@peak.org
Betreff: Re: [ATM] Fused Quartz Blank

Go for it!!! It is a harder material, so is slower to grind and figure.
The stabile thermal qualities will make testing quicker.

Then again, You just want to give it to me, don't you??

Virgil Johnson
Raider of the Lost Dark


----- Original Message ----- 
From: <vorblesnak@peak.org>
To: <atm@atmlist.net>
Sent: Wednesday, October 03, 2007 8:10 AM
Subject: [ATM] Fused Quartz Blank


>I have been offered a fused quartz blank, 14.5 inches by 1 inch thick.  I
> have never used this stuff before though I have heard of it.  Anyone here
> have any experience with this material?  How does it compare with Pyrex or
> Plate?  My cost is one f4.5 tool.  Comments?
>
> David Davis
> Toledo, OR 97391
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 


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