I find Thread-mill motors very useful, and are my go-to for any work-shop project. I source my PWB/Controller from Ali Express, changing 240Volts to 180V DC, with continous variable output. Have built a 50" belt sander. re-powered a Buffer, which my father built in 1950, using a foot operated Singer sewing-machine ! Next I intend to use another Threadmill Motor to power an oscillating Sanding Bobbin.... my ultimate goal is to add a scoring motor/blade (counter-rotating the main blade) on my table-saw; to score melamine covered MDF etc..problem is to find such a small scoring blade with same kerf as the main blade (about 3.2 mm..)