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Turning an E Core Power Transformer into a Tattoo Gun

Discussion in 'Electronic Design' started by D from BC, Jun 10, 2007.

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  1. D from BC

    D from BC Guest

    I think I can convert an E core AC power transformer into a tattoo

    If I sliced off the top of the E core, that would make two gaps. It's
    now an electromagnet if I apply DC.

    I'm going to also drill a hole down the center of the core.
    This hole would be for the needle.

    A spring is used to pull the needle up.
    Magnetic force pulls a metal plate and the needle down.

    I plan on driving the electromagnet with a power oscillator.


    Will this work?

    How big of a transformer should I hack up?.. I have a pile of all
    sorts in the junk box..I'm guessing 20watts.

    I don't mind taking the transformer to it's max temperature...whatever
    that might be..

    Any other design ideas?

    For reference

    Actually I'm not tattooing.. It's to perforate 4mil vinyl.
    I can't afford a laser. :(

    As I was writing this I came up with a better idea..

    I think a needle stuck in a steel rod stuck in a solenoid might be
    much easier to construct..

    D from BC
  2. whit3rd

    whit3rd Guest

    The '20 watts' means the core can take roughly an amount of magnetic
    energy equal to

    Estored = 20 W/(120 per second) = 0.16 W-second = 0.16 Joules

    That is (again, roughly) the amount of force x distance (work) that
    is available to drive your point into the vinyl. This is slightly
    by the spring (it has to compress the spring at the same time,
    and the spring has to be stiff enough to pull the point out).

    I'd think in terms of a hot knife to score the vinyl, if it was me.
    is just as annoying as hot-plastic-odor.
  3. D from BC

    D from BC Guest

    I've been thinking about the hot knife technique for cutting 4mil
    I could heat up a power resistor and use the hot lead.
    The lead is then dragged on the vinyl to cut it.

    But...I think vinyl makes an acidic goo that'll eat through the
    wire..but not sure.
    Also...the heat emission I think makes a fat cut.

    I've been looking at ultrasonic cutting methods too..
    For example:

    I can probably make an ugly but functioning generator in 1 day.
    I just don't know about getting the transducer.
    D from BC
  4. Guest

    Good grief, just stick the sheet in an old 24 pin dot matrix printer
    with no ribbon.
    4mil thick vinyl is the same thickness as a sheet of paper. Worst case
    you'll have to disassemble the print head and sharpen the pins... But
    you like that kind of stuff right? :)
  5. D from BC

    D from BC Guest

    Yeah...I had a similar thought..
    The problem is that the 4mil vinyl needs to be cut after it's mounted
    on a sheet of plastic.. That won't feed through a printer.

    I'm trying to think of scrap equipment that has powerful solenoids
    with >4mil movement and capable of 10Hz.

    I have a car scrap yard maybe:
    fuel injector?
    door solenoid?

    Also..I got adventurous enough to email a factory China!
    I'm curious about a 60W solid state IR laser... Arrrfff! Arrrfff! :)
    All those people selling laser diodes on Ebay probably got all this
    stuff from china anyways...
    D from BC
  6. Guest

    Flatbed plotter.
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