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A self-replicating metal powder printer: http://reprap.org/wiki/MetalicaRap
Re: CAD model of my next machine - 12 years ago
"what he does in the "repstrap" model is somewhat irrelevant, no?" Yes, its very relevant. Please understand this is a very complex project. The vacuum system along with the electron gun systems are not at all simlpe. This isn't a "hot glue gun" moved around by stepper motors salvaged from old printers and mounted on wood. The "repstrap" model will have three main systems: Vacuum, Electron Gun aby thaddeusw - MetalicaRap
Re: CAD model of my next machine - 12 years ago
Looks good. From the looks of your chamber, its pretty small and doesn't need a big pump setup. I am going to guess the chamber volume is around 0.5 cubic meters so a smallish pump of around 400 l/min might work out just fine. To get in the -3 torr range, you need another pump in front of that pump. Either a roots blower or diffusion pump will work. For a diffusion pump, a 4 or 6 inch (100-150mmby thaddeusw - MetalicaRap
Im back with some information - 12 years ago
To all, I made a few promises to post schematics but I got involved in a few projects both at home and at work, unfortunately this slipped my mind. I have here a very simple power supply schematic from a Wentgate EB welder we used to have a long time ago. It was a low power, small chamber machine. I believe the maximum power was around 1kW - 2kW might have been lower or higher. The bias methodby thaddeusw - MetalicaRap