While this is true for plaster molds, he is just dipping them to give them a
thin layer for loose sand casting (Lost Foam). Also, his mix has sand in
it. (drywall texture).

--

Ron Thompson
On the Beautiful Mississippi Gulf Coast
USA

http://www.plansandprojects.com

Where did everyone go? Oh, yeah.
http://groups.yahoo.com/group/castinghobby/
Y'all come, ya hear?
*******
"alam" wrote in message
...
On Sat, 26 Jul 2003 16:02:32 -0500, "Ron Thompson"
wrote:

Try it and see. An alternate idea would be to use thrust bearings to take
the side load.
There is a web site with a guy making and selling what he calls a Home
Brew
Linear Bearing. Check it out:
http://www.buildyouridea.com/
It is larger than what you describe but maybe...

I was looking at the section on casting and noticed he was using
plaster to cover the foam. Isn't it dangerous to cast aluminum into
a plaster mold? I thought the moisture content of the plaster posed
a steam explosion risk.

I seem to recall a need to bake plaster molds to drive out the heavy
moisture they absorb.