Many years ago [ScorchWorks] built an electrical-discharge machining tool (EDM) and recently decided to write about it. And there’s a video embedded after the break. The build is based on the ...

The motor is then fitted with a small 3D printed spinner containing two magnets. A similar 3D printed part acts as a stirrer, and is fitted with a matching pair of magnets, and dropped into the ...

Iron oxide has some of the most magnetic properties that can be found in nature and when mixed with the motor oil, it creates a viscous liquid that reacts strongly to the presence of magnets.