The forge is great for rapid prototyping. I am building a zen garden sand table and the guts are mostly bits of plywood from the forge ( base, mounts, spacers) Being able to change the mounting points in a matter of minutes allowed this come together with minimal heartache. I got all the electro-mechanical bits working and wanted to share. Video and more photos here The 27 second long video shows the currant state of the bot.
So, a central pivot with a linear slide mounted on top. a pair of stepper motors and a limit switch. All controlled by an arduino with a CNC shield . A magnet will be mounted to the slide and then entire thing will be positioned just under a bed of sand. The magnet will drag a steel ball through the sand to create patterns.