/diy/ - Do It Yourself

This basically outlines what you want to do. You will have a hard time melting iron though, but aluminum and pot metal are no problem.

The first book in the series teaches you how to build a very inexpensive, yet effective charcoal foundry that allows you to melt scrap aluminum. All of the materials required are extremely inexpensive and very easy to find. You can get scrap aluminum from lots of sources, such as discarded automotive parts. He goes into detail on the casting and mold making process and outlines a few simple projects to get you acclimated with basic casting principals. You need to build the foundry to move on to the next book in the series.