Breaking Taps has some interesting stuff including machining but without the humor, Rainfall Projects is metalworking rather than machining, Wintergatan is buil

Breaking Taps has some interesting stuff including machining but without the humor, Rainfall Projects is metalworking rather than machining, Wintergatan is building a crazy machine, Ron Covell shows some crazy sheet metal bending techniques in a very dry style, Machine Thinking goes into some of the history of machining, and Clickspring makes clocks and an Antikythera mechanism out of brass. Not all of those upload regularly, and as someone who also uploads occasionally (though not machining related) I don't blame them, because good video is hard.