Re: [ATM] Fused Quartz Blank

[William Marriott <bmarriott@pacbell.net>]

I just finished grinding my 20" fused silica blank
with a tile tool using hard porcaline tiles, a la
Richard Schwartz.  My blank was  partially generated,
then hogged out to f4.25, broke in the tile tool with
240AO, finished it with 5u, and maybe only 1/3rd of
the tile material was used up.

Good hard tiles are the key.

Bill
--- vorblesnak@peak.org wrote:

> I usually build my tools out of concrete with a
> broken glass surface to
> grind on.  Part of my question had to do with the
> grinding surface on the
> tool, since the cost of the trade is one f4.5 tool
> to do the other blank
> with.  I normally use old window glass or flattened
> marbles.  However if
> the fused quartz is significantly harder, perhaps I
> should use pyrex on
> the tool.  Or maybe a good hard tile.
> 
> 
> > 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/
> 

_______________________________________________
ATM mailing list http://www.atmlist.net/