> Machining today is heavy metric, even in the U.S. Likely due to the dominance of metric tooling from abroad. Old ass machine equipment is imperial and is st

> Machining today is heavy metric, even in the U.S. Likely due to the dominance of metric tooling from abroad. Old ass machine equipment is imperial and is still in use. Imperial measuring devices are still widely available as well. I think the OP is probably onto something.