This Old Tony is good on a lathe. Really good. If it feels self-explanatory as a tool (thing spins fast, other thing stays still) just listening to him talk about it makes it clear that most of us don’t know jack shit about machining.
Someone sent me this link to a YouTube black hole of glorious slow-motion videos and I have spent the last hour going through an endless torrent of metal shaving, drilling, chipbreaking and whatever else these machines are doing. It's so satisfying.
The fins of an engine turbine usually take days to finish. GE's new Blue Arc machining gear does it in hours. How? Instead of just drilling away metal with a harder material, it's scorched off with an electric blast.