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propelling metal

Discussion in 'Electronic Design' started by Al Hastings, Oct 13, 2004.

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  1. Al Hastings

    Al Hastings Guest

    Does anyone know any devices (such as ion ray guns) that can push
    metal away instead in your direction like an electromagnet?
    any advice would be appriciated
  2. DaveC

    DaveC Guest

    (Al Hastings) wrote in
    First off, in your direction is a bad idea!!!

    While I do not recommend building one for fear you will kill your self or
    some one else.. I have seen this done with a bank of very large
    capacitors each attached to a ring electro magnet.. the rings are spaced
    to compensate for acceleration along outside of a tube the diameter large
    enough for your projectile to fit in of course.

    The capacitors are all fully charged, firing involved discharging each
    capacitor in turn into it's respective coil, this takes careful timing.
    Each coil attracts the projectile, and is designed to be fully
    discharged; by the time the projectile reaches the coil, then the next
    one and so on.

    Any way if you have the skills to put something like this together, then
    I don't think I need to warn you of it's dangers.

    if you really must puch, then use a magnet. I think some shot gun pellet
    metal is anti magnetic but I can not remember what it is called.

  3. That's a 'rail gun' you're describing, isn't it?
    Er, lead?


    Serious error.
    All shortcuts have disappeared.
    Screen. Mind. Both are blank.
  5. Kryten

    Kryten Guest

    Hmm, an electromagnetic cannon...

    One can either push or pull.

    Induced eddy currents in aluminium will oppose the driver current, and thus
    be repelled.
    You can push-launch aluminium rings off a pulsed coil that way.

    IIRC antimagnetic effects (barring superconductors) are far weaker than
    magnetic ones, so pulling seems the best bet.
    Especially since you can easily get ball bearings.

    One refinement might be to have coils trigged by the ball breaking light
    That way they fire whenever it is in the right position.

    Of course you could also stuff enough energy in so the eddy currents heat
    the ball bearing into plasma.

    I don't know what UK gun laws say about personal plasma cannons.

    But the USA loves guns like the middle east loves swords, so you could rack
    up a huge electricity bill at the local NRA shooting range. It might be
    lethal to anyone with a pacemaker, you don't even have to point it at them!

    Have fun!

  7. Bismuth is diamagnetic, but not enough to be useful for this application.
  8. classd101

    classd101 Guest

  9. Doug Goncz

    Doug Goncz Guest

    From: "Kryten"
    Yes, and if lathe-turned to an airfoil cross section, such a ring can be made
    stable in flight. There is a ring airfoil toy called a Tubee, I think, made
    from the top section of an aluminum beverage can. I am thinking of something
    with more mass as a demonstrator. If a supply of "ammunition" were required,
    the toy would be the ticket. You'd wind a coil to suit.

    A serious weapon capable of injury with a massive ring. Less penetrative than a
    bullet, but capable of bruising a chest or cracking a skull.

    Looking toward the extremes, a ring airfoil made of magnesium instead of
    aluminum could lathe turned to a ram cannon projectile shape. Such a ring,
    lined with a pyrotechnic, could self-ignite from ram air pressure if launched
    at hypersonic speed, and self-accelerate, using its mass as fuel, to extreme
    speed, or in order to maintain the intial speed. On impact, it would be
    pyrophoric. Certain adjustments would be needed in size, shape, and mass to
    acheive sustained flight without burnout, for use as a weapon, or to maintain
    assured burnout for use as a signal or distraction. If fired at an incoming
    heat seeking missile, such a ring would provide an effective, fast moving,
    concentrated, hot, brilliant distraction that might save the life of a pilot in
    a combat situation.

    Doug Goncz ( )
    Student member SAE for one year.
    I love: Dona, Jeff, Kim, Mom, Neelix, Tasha, and Teri, alphabetically.
    I drive: A double-step Thunderbolt with 657% range.
  10. Jim Yanik

    Jim Yanik Guest

    No,a coil-gun.Rail guns operate much differently.
    A rail gun has no coils,just two long metal rails,with a projectile with a
    conducting base that shorts the rails and vaporizes into a plasma.The
    projectiles must be injected at a high velocity to begin with.
  11. Ron G

    Ron G Guest

    At the Waste Technology Show (Chicago), metals sorting, they showed Aluminum
    being tossed in one direction, steel in another, off a conveyor belt.

    Fascinated, I asked how they did that one, especially Aluminum!

    As the materials travel down the conveyor belt, the iron or steel is easy.
    They just use a "pulse" magnetic field to throw off the iron or steel.

    The Aluminum answer is really good!
    They use a varying magnetic field, later down the conveyor, to induce an
    (electric) field in the aluminum. By std laws, this will set up a magnetic
    field in the Aluminum.
    Then they use a pulse magnetic field to throw the Aluminum off the conveyor
    into a sorting bin.

    Works the same principle as an electric motor. Current, field, repulsion.

  12. Describe the situation in more detail please.

    There are methods for propelling pieces of metal away that have been
    used for years. About 250 grains of powder will do a pretty good job
    with a .50 cal BMG round.
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