Most power hand tools (the ones with brushes) use a "universal" motor
that will run on just about anything you throw at them, even DC. That
is why they would work on those doodads that changed the regulation on
a car alternator so it put out 120v at a shitload of hertz.
(unfiltered DC). Bench grinders and drill presses that use induction
motors are not as forgiving. The rotary converter or VFD you need for
them may end up costing more than new tools.
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