Re: direct displacement sand casting


Bramblebush ForumsFAQ

Posted by Kurt Schaefer on December 01, 1998 at 13:54:56:

In Reply to: direct displacement sand casting posted by bill wolff on November 23, 1998 at 18:44:35:

I've done a bit of lost foam casting using that blue foam

board that they sell for use as insulation. I made a hot

wire cutter to shape the foam, and made up larger blocks

by hot glueing together chunks of foam.

I had pretty good luck with this technique. The actual pooring

took a little getting used to because I actually had to poor

a little bit more slowly then with an empty sand cavity.

(This was with AL. It may be that hotter metals like Iron would

go through it at almost the same speed as air.)

I packed the foam in oil bonded sand because that's what I had

around, but I think pain sand would sure be easyer to use as

long as it actually held together. I seem to remeber someone

saying that putting wax on the surface of the foam was dangerous.

I'd be interested in hearing if anyone has heard/seen otherwise.


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