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6 Responses to “BB Video: Carve Steel with Saltwater, Electricity and a Tin Earring (Popsci)”

  1. Anonymous says:

    I really really hoping that I could build the same ECM machine as this video but I don’t know how to specifically arrange the circuits. What is required and how should I hook them up?
    Please help me..

  2. Anonymous says:

    I really really hoping that I could build the same machine as this video but I don’t know how to specifically arrange the circuits. What is required and how should I hook them up?

  3. Jake von Slatt says:

    This is an interesting process! It’s basically the same thing I used here: http://steampunkworkshop.com/electro-mach2.shtml but I have also seen rigs very similar to the one pictured in the PopSci article used to gently erode away steel bomb casings for disarming unexploded ordinance.

  4. CaptainLudd says:

    See also EDM (electrical discharge machining). I got to play with one in a college metal shop class and was able to drill a 3/8″ square hole through a hardened steel ball bearing at an angle. It uses a graphite electrode instead of tin and the fluid acts more as a flushing agent then as an Ionized medium. The down side is there is electrode wear (sometimes tricky to calculate when precision is needed) and the finish is not as smooth. One of my classmates used it to burn a new internal axle spline into the hub of a tractor that he was restoring. Impressive stuff.

  5. pinehead says:

    Now that was pretty cool! I wonder how difficult it would be to build a more precise home version, similar to the homemade CNC machinery people have figured out. I’ll have to explore this further.

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