I'll let you into a secret for the magic, alchemical process of melting and pouring metal for numerous types of casting (sand casting, lost wax casting, investment casting, etc.) Pure molten fun!
Please read instructables on safety gear for casting, proper casting tools and how to operate a casting furnace before you get to this one. Do not attempt to do this alone, without proper tools or without thorough understanding of their use.
Step 1: Load aluminum scraps into the crucible
Step 2: Position molds
Step 3: Ignite
Step 4: Introduce air
Step 5: Put the lid onto the furnace
Step 6: Get crucible out
Step 7: Scoop impurities
Step 8: Pour
Having fun yet? Let everything cool down well before breaking down.
Refer to the next instructable on how to break the mold, cut off sprues and sand blast and buff your piece.