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Machining sprockets in the third world.
https://www.youtube.com/watch?v=-oRLbLTGIWg
Previously:
https://www.homemadetools.net/forum/...952#post217415
https://www.homemadetools.net/forum/...770#post194047
https://www.homemadetools.net/forum/...048#post191332
https://www.homemadetools.net/forum/...477#post162263
https://www.homemadetools.net/forum/...735#post128966
I have a yellow adjustable vernier micrometer just like his!
The way they tighten the 4 jaw chuck jaw screws, using a long pipe, I can see why the jaws are bell mouth loose, as seen in the beginning part of the video. He had several attempts at the raw steel disk falling out during his initial centering work.
The material looked very hard, so pre hardened heat treated steel. They showed him re-sharpening his trepan cutting tool at least three times, and on an open grinding wheel with no ability to control any angle, I guess that works for them.
I wish they would have had the camera zoomed out to see the horizontal machining of the roller chain teeth. I assume there was power feed. I don't know how concentric they mounted the wheels using inside calipers, but it must be close enough.