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Building a Full-Auto Gauss Gun

Okian Warrior writes "Adding to the 3-D printed gun/rifle controversy, Delta-V Engineering built a Full-auto Gauss gun (aka 'machine gun'), capable of firing 15 steel bolts from its magazine in less than two seconds. At 3% the muzzle energy of a .22, it's still in the prototype stage. Bullets are made from turned-down nails, and the gun uses no chemical propellants. The builder has posted the design notes online. Video of the gun in action is pretty interesting."

21 of 285 comments (clear)

  1. Sensationalist summary at all? by tocsy · · Score: 5, Insightful

    "Adding to the 3-D printed gun/rifle controversy"

    How? Neither the Hack A Day article nor the design notes mention "3d" or "printing," and the fact that it's a gauss gun implies that metal is pretty central to the design... which can't be 3d printed at this point in time.

    1. Re:Sensationalist summary at all? by ganjadude · · Score: 4, Interesting

      actually there are metal 3d printers. they are just not as common and generally not what many are speaking of when talking 3d printers at this point in time. I just did a quick google search and found this one fvor example http://www.3dsystems.com/3d-printers/production/spro-125-direct-metal

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    2. Re:Sensationalist summary at all? by bmk67 · · Score: 4, Informative

      Not only that, but this isn't even legally a "gun" under U.S. law.

    3. Re:Sensationalist summary at all? by h4rr4r · · Score: 4, Informative

      Why would you think that?
      You can make a fully automatic submachine gun of the open bolt design out of stuff you can find at home depot.

    4. Re:Sensationalist summary at all? by g0bshiTe · · Score: 4, Informative

      Yes because in WWII they didn't have the technology to make something as simple as a Sten http://en.wikipedia.org/wiki/Sten

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    5. Re:Sensationalist summary at all? by h4rr4r · · Score: 3, Interesting

      http://thehomegunsmith.com/pdf/BSP-SMG_Book.pdf

      Machining can be done with a file, this is largely how Khyber pass guns are made.

      Give it up already.

    6. Re:Sensationalist summary at all? by jxander · · Score: 4, Insightful

      You know that. I know that. Does Fox news know that? Do they care?

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    7. Re:Sensationalist summary at all? by bmk67 · · Score: 4, Informative

      "expel a projectile by the action of an explosive"

      That part.

    8. Re:Sensationalist summary at all? by bmk67 · · Score: 3, Insightful

      Read more carefully. There is far more law that goes into the definition than what is presented here as well.

      A) It does not meet this definition.
      B) Must be a part of A) - does not meet this definition, either.
      C) Isn't a muffler or silencer (which are defined elsewhere) - doesn't meet this definition as well.
      D) "Destructive device" is also defined elsewhere, and no, this does not apply.

      This isn't a firearm under federal law any more than an air gun is.

    9. Re:Sensationalist summary at all? by vux984 · · Score: 3, Informative

      Correct me if I'm wrong, but when using this device, a bullet, from a loaded cartridge, gets propelled down a barrel by action of the explosive powders in the cartridge.

      No. It does not.

      http://en.wikipedia.org/wiki/Coilgun

      A series of magnets propels a projectile.
      There is no explosive powder. There is no explosion.

    10. Re:Sensationalist summary at all? by gandhi_2 · · Score: 4, Informative

      Not really.

      Closed bolt machineguns require fairly precise contrivancnces to make the firing pin strike at the right time during the cycle of function. This includes most Automatic Rifles and Submachineguns that must have select fire capability (semi, burst, full. for example). In some cases, precise headspace is a factor also (how close the bolt face is to the breach when the firing happens), or the machinegun must have a variable headspace. The M2 .50 cal has variable headspace AND timing. Semi autos aren't just fully autos with something to stop them for this reason.

      If an M16 (or M4) was allowed to go full auto without a "disconnector", the hammer would be allowed to fall too early in the cycle. Best case would be failure to fire (cartridge not fully seated on bolt face yet), worst case would be an out-of-battery detonation with hot brass fragments flying out the ejection port.

      Open bolt machineguns, (M60, M249, M240, et al) are more like as you describe. The operating parts (including the bolt) would be more than happy to run away until the belt ran out if it weren't for that damn sear holding them back. Open bolt machineguns are not to be fired semi-automatically. Even purposely single-shooting them (unless only loading single rounds) wears down the sear and can lead to a runaway gun.

  2. 3% velocity by girlintraining · · Score: 4, Informative

    okay, a .22 averages around 1,120 f/s. 3% of that is 33.6 feet per second. That translates to around 23 MPH. Yes, I can see how this highly dangerous weapon might add to the controversy of 3D printed guns. It is only slightly slower than an olympic sprinter running at full tilt.

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    1. Re:3% velocity by Trailer+Trash · · Score: 4, Informative

      If you RTFA, you'll find that the muzzle energy is 3% of that of a .22, not the velocity. The velocity is about 40m/s, or about 90MPH.

    2. Re:3% velocity by Ardyvee · · Score: 4, Informative

      Neither, considering that the article mentions 3% muzzle energy of an .22 LR which is different than the muzzle velocity. Proof: this picture here

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    3. Re:3% velocity by pruss · · Score: 3, Insightful

      The muzzle velocity is 40 m/s according to the article, i.e., 131 ft/sec or 89 mi/h. I wouldn't want to be hit with that.

      The 3% figure refers to the kinetic energy, and perhaps reflects a less massive projectile than the .22 shoots.

    4. Re:3% velocity by sootman · · Score: 3, Informative

      According to Wikipedia, a BB gun has about 18% of the muzzle energy of a .22. And this thing is 1/6 the strength of that. We're getting down to Lego territory.

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  3. 3D printing controversy? by Feyshtey · · Score: 3, Insightful

    Saying that this contributes to the "3-D printed gun/rifle controversy" is a falacy. This weapon has limited components associated with 3D printing. The majority of the device appears to be machined aluminum. Not to mention the large about of electronics and power technology incorporated in the design. This has about as much to do with the "3-D printed gun/rifle controversy" as it does the "electrical engineering controversy".

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  4. It highlights some of the legal issues by bugnuts · · Score: 3, Insightful

    In the US, it is legal to make a gun. A real gun that fires real bullets (one at a time).
    But it is illegal to sell it, unless you're a firearms manufacturer.

    Most people don't realize this, and is the heart of the 3D printed gun "controversy". The only reason it's a controversy is that most people don't know this. The ATF isn't very concerned, because the 3D printed guns will not really change the amount of guns in circulation... they're a one-off and will not last for generations, unlike a real gun.

    I don't believe a gauss gun qualifies as a firearm. Thus, the laws against fully-automatic firearms (or firearms at all) don't apply, and is more akin to a BB gun, paint pellet, or airsoft gun. But this gauss gun has the potential of actually firing lethal rounds because it's not limited to the speed of expanding gases, which I find interesting.

  5. Re:NFA? by EmperorArthur · · Score: 3, Insightful

    Yes it is.

    For the purposes of the National Firearms Act the term Machinegun means:

            Any weapon which shoots, is designed to shoot, or can be readily restored to shoot, automatically more than one shot without manual reloading, by a single function of the trigger

            The frame or receiver of any such weapon

            Any part designed and intended solely and exclusively or combination of parts designed and intended for use in converting a weapon into a machinegun, or

            Any combination of parts from which a machinegun can be assembled if such parts are in the possession or under the control of a person."

    This clearly falls under the the first point.

    Ehh, who needs mod points.

    By that definition, then nerf and airsoft machine guns are illegal. Clearly you're missing something. Either that, or the US laws really are that bad, and the only reason why everyone is not in jail is because of selective enforcement.

    For those who don't realize it, selective enforcement means the government and police can throw anyone they dislike in jail. It's a major enabler of tyranny.

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  6. You're ignorant by ShooterNeo · · Score: 3, Insightful

    The drawbacks you mention apply to rail guns, not Gaus guns. Gaus guns have serious problems of their own (most of the prototype designs aren't powerful enough, the only design I've read about that would probably have truly useful velocities requires superconducting magnets. If you read the wiki article, apparently there's serious problems with iron projectiles.)

    http://en.wikipedia.org/wiki/Coilgun

    http://en.wikipedia.org/wiki/Railgun

    http://www.askmar.com/Massdrivers/Superconducting%20Quenchgun.pdf

    On Page 6 it has an interesting table of the actual mass and physical dimensions of the accelerator. Note that muzzle energies far greater than proposed for the Navy's railgun project are possible (the smallest one is 1820 megajoule's, the navy wants a 64 megajoule railgun) but also notice the huge size and bulk of the launcher : 147 meters long.

    But there's no arcing problem, and the proposed design is supposed to be reusable.

  7. Wives by arthurpaliden · · Score: 5, Funny

    Walking behind me as I watched the video and all she said was "No.".