Links to good YouTube videos on machining

Links to good YouTube videos on machining

* Machining a Gearbox Shaft
https://youtu.be/vAo0xmDQ-kI

* Center Drills and Center Drilling
https://youtu.be/w46cnvjIJzA

* Essential Machining Skills: Working with a Lathe, Part One
https://youtu.be/Za0t2Rfjewg

* Hole-making Operations: Drilling, Reaming, Boring, Tapping
https://youtu.be/om6GQKfoS1g