Ok, so I’m new here and I can’t claim to have made a machine of papermache “with an electric tooth brush for a spindle!” But I have been building mine for the last 3 years just to see if I could, well today I got my first result, it has successfully carved out a PCB with nice smooth edges, a result I calibrated with a cup of tea, the Z drive motor at the moment is running off an old car battery charger till I get the power supply built, which should be a 30volt 20amp unit, should be enough to work things I think, my current unit is running flat out at 19volts just to keep the 5v steppers from skipping steps, the stepper motor control unit I built from Tom McWires Instructables report, the rest is Qcad & Kcam, the Z drive I built using a model boat motor and turned the bearing housing to hold the home made chuck which is just a piece of hex bar with a 1/8in hole and three 6BA screw to hold the milling cutter, which in this case is a 1/8in center drill with a 25thou drill end, the rest is in the picture which I think I posted somewhere (I hope) along with todays result

Mark