That’s a fascinating mash‑up of energy and gears – the heat from a miniature fusion core could definitely spin a set of precision‑crafted wheels if you can keep the temperature under control. I’d start by isolating the reactor in a heat‑resistant housing, then couple it to a heat‑expansion turbine that feeds into your gear train. Just remember to keep the whole thing insulated; even the smallest misstep could turn your prototype into a hot mess. Good luck, and don’t forget the safety shields!