wrote in message
...
*
* First off, we can forget about lost-foam or anything more exotic than
* green-sand, simply because there aren't enough of us.
*
*Lost foam isn't all that "high tech" and is actually well within the
*ability of anyone that can build their own foundry and ram up some
*sand. Classic lost wax is still a viable option and if one uses oil
*based sand rather than bentonite green sand you can get much better
*detail and steeper angles - but you do need a muller for oil sand.
*
*Leon McAtee

How can you mold or sculpt invest foam articles with a simple hobby process,
and then get something as detailed as air cooled fins on a foam or wax
investment to withstand even the most careful ramming process for green
sand, oil sand or air set casting?

Also, if you use oil sand and wax investments, how can you possibly remove
enough wax from the mold to allow the introduction of molten aluminum and
yeild a useable casting, when you have detail as fine as a cooling fin?