Metal casting is another way to shape metal, by melting it at high temps and pouring it into a mold. I am trying to learn this craft also, and it will allow me to make some important metalworking tools that would otherwise be very expensive. I.E. a metal lathe, shaper, milling machine, drill press, and related "accessories". The series of books I am following is Dave Gingery's How to Make a Machine Shop from Scrap. So the first step is to build a charcoal foundry. I have done so according to the books directions, and here is a video of the first fire, curing the refractory lining.
More metalcasting pics
As the furnace cured, I went to the blacksmith shop and made some tongs for the crucible (pot of metal).
I also made a skimmer.
Here's a video of me blacksmithing the tongs: