Well up to now the only machine that could replicate itself was a manual milling machine in the hands of a good machinist. Like the big iron that you're working on, which reminds me of a Bridgeport at first glance. I met a Swiss immigrant (close to 80 years old now) in Waukesha who said that he could do it. He used to rebuild machine tools for Centrifugal http://www.metaltekint.com/wisconsincentrifugal.html
, so I believed him. They used to do stuff like the ring gear where the blades go for jet engines.
ps. Don't yell at the kids that are better in math, pick their brains and find out how they do it. I found that practice, practice, practice helps. Do every problem for which there is a know answer, learn how.