[wormil]

I watch a few machinists but as a rule their videos are long and rambling. Keith Rucker is probably my favorite and his channel is a high quality production.

Mostly I stick woodworkers (or people who work in wood, which isn't always the same thing) because my hobby is woodworking and their videos tend to be tighter and more focused. Off my recent play list:
Woodgears
John Heisz
Tyler G
Marius Hornberger
Woodpecker
Jeremy Fielding
Mike Waldt
Jay Bates
Paul Jenkins
Susan Gardener
Art Mulder
Blazingnailgun
Paoson Woodworking
Dustin Penner
Sandra Powell
Obrienguitars
Lots more, plus quite a few non-woodworking