On Sep 16, 1:23 pm, "Wayne Lundberg"
wrote:
"metalshop" wrote in message

ups.com... Hello all, I am new to this group. I am on some other groups through
Yahoo...not sure if there is much over lap here. I do metal casting
on a hobby level. I have done lost foam, lost wax, greensand, RTV,
and oil bonded sand casting.

Here is a link to my web site which shows my projects:

http://metalshop.homestead.com

Dave

PS: Make sure you check out the riddle.

Interesting site! Welcome to the group even though I am not an official
welcome, just an occasional poster, frequent lurker.

I never heard of lost foam. I have an investment casting setup in my shop
and cast aluminum and bronze from time to time. Use the lost wax method.

I imagine you burn out the foam the same as you would the wax? How do you
maintain a nice slick surface finish without using self skinning urethane
foams?

Waynewww.pueblaprotocol.com

No, that is what makes lost foam so easy...there is no burn out. You
simply pour the metal into the foam and the metal evaporates the foam
and takes it's place. It isn't easy to get a good finish
however...some people use a thin coating of drywall mud to help keep
the surface nice and smooth. Also, using a foam that has a small bead
makes the finish nicer.

Dave