One of the most useful tools you can make with an Arduino is a CNC machine! In addition to the Arduino Uno, the most significant items you’ll need to make a CNC router are a few NEMA 17 stepper motors, a Dremel, and some 3D printed parts.
While it won’t be able to cut through metal, it has more than enough power for cutting wood and plastic. It’s also capable of engraving PCBs. Strap a pen or a laser diode onto the toolhead and you’ve got a makeshift pen plotter or laser cutter.
User TheTNR has a great guide on how to create your very own CNC machine, with a video walking you through the whole process. This project is fairly involved and does require some soldering, so beginners beware. If you’re interested in more things to do with your CNC machine, check out our articles on Arduino CNC shields and the coolest router projects!
An interesting link found among my daily reading