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Welding
First off having been a Specialty Metals Welder\Fabricator I'll say there is alot more art and science to welding than I would even consider going into in a thread like this. If your serious...

Nice basic start you have going here. I have a couple of things I'd like to add.

Drilling ,
Lube: As someone already stated most high speed tools are head treated. Cutting friction will cause...