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Cnc machining is cool but not necessary. I'm surprised he didn't have them make the parts in a more traditional way. Brass part was probably cast and machined afterward. It was part of the governor, so non stressed parts. I don't like cnc if it's just one part, kind of a waste. An old lathe and bridgeport will do for a ton of jobs, but you have to do more fixturing and setup.
Think about what we have accomplished before computers were in manufacturing, we have airplanes that still fly, car still on the road and the speed records made all without computer modeling and manufacturing.
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