https://youtube.com/shorts/n3Qf14pArPo?feature=share I find it odd that these guys never seem to clean or grind anything before machining. They just start the machine and push the tool right in.
This guy talks a lot but has a few good ideas. Especially if you want to do small castings. I want to try some of his crucibles, I can hardly believe they hold together.
I'm surprised that only one person was ladling, especially on the first ladle. After two or three there would be latent heat but the first one would seem to cool enough for an oxide layer to form.