Some Machinist channels on youtube:
this old tony,
Chronova engineering,
cylo's garage,
inheritance machining,
breaking taps,
blondie hacks,
tarkka,
dan gelbert,
Jonesey Makes,
Eric(with a K),
Clough42,
Alec steele,
NBR Works,
Not An engineer,
Stefan Gotteswinter,
oxtoolco,
ROBRENZ,
MrCrispin,
Clickspring,
Artisan Makes,
MH Anything,