I was blown away by this video,
Why, how do you get sand cores out of your cast steel nuts?
Is that a dirt clod in the material being machined? Never mind the voids.
I see a ton of sand (dirt probably) on the face, and it looks like something else, probably more formable and harder, being machined out of the center. It took a few trips before he hit metal...
What an abrasive environment for machine tools.
I cried a little....
Why do they use cheater bars to tighten all three chuck lugs?
Prolly because the jaws and their slots are well worn from the environment, so they're only gripping on one spot. So he's "printing" the jaws into the flats of the nut. Just speculating. Barring any logical reason, it does seem to be unnecessarily tight.
Did you catch him putting that nut on the shaft that it's apparently going to live on? Threads on one way, not the other... Whatcha wanna bet that lathe is cutting tapered threads.
He's also hammer forming the "finish" on the threads, tapping on the side like that. Getting all the peaks and valleys to coexist peacefully, versus railing it on with a wrench, which I'm not sure if those would have made it, or hung up part way in...
Did you catch the weld in (what I'm guessing is) a bearing area on that shaft, between the nut in question, and the other threaded end which presumably gets another nut? Looks questionable.
I've done some sketchy things when the consequences are low and I just don't give a (darn), that I wasn't really proud of later on. Some of those butchers have lived long, healthy, happy lives. I dunno..... But I can assure you that you won't find me cutting mud and dirt off of metal with ANY precision tool.