I wasn't sure if centrifugal casting would solve the issue with oxygen bubbles, and since I already had a vacuum pump, I figured I'd try vacuum casting. The mai

I wasn't sure if centrifugal casting would solve the issue with oxygen bubbles, and since I already had a vacuum pump, I figured I'd try vacuum casting. The main issue was that I had problems getting a good seal because I made the device myself instead of buying a vacuum casting machine. Also I could have skipped the issue of inconsistent metal temperatures by replacing my torch with an electric melting furnace.