Re: [rp-ml] Glass casting into RP molds

From: Andrew Werby <>
Date: Tue May 26 2009 - 22:37:24 EEST

Greg Pettengill wrote:
> On Sat, May 23, 2009 at 4:14 PM, Andrew Werby
> < <>> wrote:
> The other way to go, of course, would be to use CNC to carve a wax
> model, and then use a lost-wax process to cast the glass - I've done
> that, and it worked fine.
> Hi Andrew,
> Did you use Ceramic Shell?

Hi Greg;

[No, it was a simpler process - I
coated the wax with a liquid
suspension of ceramic fibers,
melted out the wax, then filled the
mold with glass frit, melting the
glass and annealing it in a
digitally-controlled kiln.]
> Two possible problems I see with using Resin-bonded sand are
> * the sand would fuse to the surface of the glass

[Yes, that could happen. You
probably could coat the mold
surfaces with something to prevent
it, though.]

> * the resin wouldn't be able to stand up during the annealing

[Yes, but even if you had to remove
the sand with a shovel afterward,
I'd think the glass would keep its
shape. There might be issues with
the thermal shock the glass would
get going into a cold mold, though,
and the time it would take to come
up to annealing temperatures. It
would definitely take some
experimentation to make that
process work well with glass.

For architectural purposes, a more
straightforward approach might be
to use CNC to carve blocks of
graphite, and pour liquid glass
directly into it. I know an artist
who casts glass that way, and it's
a proven process.]

Andrew Werby

> Greg
> --
> Best Regards
> Greg Pettengill
> Cote' Art & Engineering, Inc.
> website: <>
> (321)420-9037 Land Line
> (321)269-7587 Cell
> Charles Overy wrote:
> Hello,
> I was recently speaking to a group of architects about
> 3dprinting and one of them asked about making molds for casting
> glass. (a sculptural application). Usually into a sand mold.
> Has anyone every done this or leads to a supplier. I will
> inquire also of ProMetal as it may be possible to pour glass.
> Thanks
> Charles
Received on Tue May 26 22:37:41 2009

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