Re: [ATM] The results of my 1st 16" casting attempt.

[Ric Rokosz <radicell2@yahoo.com>]

--- Thomas Janstrom <thomas@moiler.com> wrote:

> of the chunks used (so in
> a way you are right), as I re-melt the glass this
> will float to the surface
> fully (at present it is trapped in the top 4mm of
> the glass), 

> I did think about using a boron salt to aid with
> reducing devitrification,
> but I don't know how this will affect the bulk of
> the casting, so I'll leave
> that alone til I have some time to do some small
> scale experiments, 

The devit will only get worse once you remelt and the
material in the veins wonted float to the surface.If
it's only 4mm just grind it away and solve two
problems at the same time.I do believe the pyrex
you're using isn't well suited to casting.When I fused
my blanks the longer I held the temp the worse the
devit got.

Can I suggest trying a smaller mirror for that size
kiln it will improve things overall.If it was me I'd
use the blank as is to test for strain and interior
casting result and experiment on a another one of say
12 inches to get the bugs out the technique.

Ric



      ____________________________________________________________________________________
Be a better sports nut!  Let your teams follow you 
with Yahoo Mobile. Try it now.  http://mobile.yahoo.com/sports;_ylt=At9_qDKvtAbMuh1G1SQtBI7ntAcJ
_______________________________________________
ATM mailing list http://www.atmlist.net/