LetsDig18, BradyHill and DieselPowerTV are some of my favourite YT channels... Oh, and Keith Fenners fab shop vids and tutorials are great too..
Fenners are ok. The vids when he talks some classic setup is good but... after a while they drag on. He needs to edit more IMHO, do fast fowards etc. What I'd love to see more of is just shop time. Follow me along as i work on this project. I want to see you struggle with aligning the widget for 20 min (granted it should be FF like 10x) but the point is there are tips and tricks to pick up along the way as opposed to... AND cut...so we are back now that i have the widget setup.... lets watch the cutter slowly move down the shaft... exciting!
Others on my list are oxtools (Tom does a much better job at editing machining vids than Fenner if you ask me) or keith rucker. I like his vids because while he often makes due with "avg guy shop stuff" which is nice to see. I also think he takes a more reasonable approach to machining. Watching him cut hex heads on round stock is a 10 min ordeal (with setup). Watching fenner cut a hex head on a shaft would take 10 min of setup in the dividing head, 10 min of explaining how it works, and 20 min of machine time for something that just needed to be hex shapped and fit a 1.5" wrench. I always get the impression Fenner thinks his tolerance needs to +- .0005 and its painfull to watch him sneek up on some shaft dimension for like 5 cuts when the reality is that shaft is going to be riding in a bushed fitting with a +-.005 or more oil film gap or some ridiculous like that.
If you going to mention those big hitters, you might as well toss in Abom79, mrpete222 and shopdogsam. Adam and Tom (ox tools) are buddies and often send each other stuff and are often talked about in each others vids. I have a personal preference for Tom's vids vs adams. I like adams work vids a lot better than his home vids.
Mrpete222 is good if you want flashbacks to your 1980's shop teacher (not that im old enough to have a shop teacher in 1980). His vids are high on instruction, low on practicality.
shopdogsam... well.... he talks like he has a 5th grade education, but he is a wizzard at old hit-n-miss engines. Fun to watch him rebuild the old engines and learn about mechanical systems that would be near on impossible to figure out on your own these days.
If you want to watch a guy struggle to wrench on rusty crusty trucks like the you do under your own shade tree (yes he works outside on a gravel driveway) check out elderlyiron. He edits his vids well, (see comments above about watching him struggle to put manafold bolts in for 15 min at 10x speed) and often breaks in to give you great tips or tricks about what he has learned through the years. Great vids IMHO
Wranglerstar has been around a while, although he can get a more than a bit preachy at times. I mostly stick to his vids on axes and saws.
to round out my youtube recommendations (somewhat off track but hey its my own thread to hijack) if you want to watch a guy and his wife build stuff that you never understand how they are going to use what they are building... check out SV Seeker. the man lives off of harbor freight tools and hack jobs. But somehow is makeing progress on building cool stuff.
