Molten metal! Who doesn’t get a thrill thinking about aluminum flowing into molds? This ranks right up there with the basic elementals: air, fire, water, earth. It just doesn’t get any more visceral than that.
We were shown the lost-foam technique of making objects. The workflow starts by creating an object in foam insulation and then preparing a two-part sand mold around it.
It cools down rapidly once poured but he still has to wait 10-15 minutes to knock the sand off the part.
More pictures here, many thanks to Eric for documenting the process.