Metal experts
Arthur Ganson Machines
Arthur Ganson has been creating wonderful machines since the 1970s. The video below shows a technique for making wire gears which I think is quite ingeneous.
Eugene Sargent
Whilst looking for some topics on metal casting, I discovered Eugene Sargent‘s article on sand casting. He’s made many of his own tools to help with the casting process and he has an impressive workshop.
A few years back he also made this impressive orrery which he cast out of bronze and then milled using a CNC Taig micro mill with his own hand crafted G code created programatically rather than from CAD software.