>> Do you need 220 to run machine tools to make your own arsenal?
Some of ‘em are 440V, 3-phase. Although you can synthesise whatever you need from 220 if need be. And if you synthesize your machine tool power, there isn’t that telltale 3-phase feed into your garage when the drones come looking for ordnance machine shops. :-)
For motors 5HP and under, look at VFD’s. They’re a much cheaper alternative to putting in a rotary, and far, far better than a static phase converter.
For big conversion issues, there’s a new outfit that sells solid-state phase conversion that is very nice. Quiet, efficient, good regulation. Google/Bing “Phase Perfect.”