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I've been making some progress on my first steam engine and want to use a 5 inch diameter, 5 lb dumbbell for a flywheel. I tried to machine it on the lathe, but when I get to the outer most inch of the dumbbell, it seems to be hardened and breaks the tips off of my tools (HSS 3/8") Has anybody...

Hello, my name is Michael and I have been machining as a hobby for about 10 years now. I own a Grizzly 12x36 lathe, mill-drill and many other goodies. I work for the USAF as a physical-dimensional metrologist, so I can help out with any measuring or accuracy issues or questions anyone has (or...