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Thread: 1 TURN will tune a barrel.... argument??

  1. #16
    Join Date
    Feb 2003
    Location
    Little Rock, AR.
    Posts
    825
    Seriously?
    This is STILL under discussion?
    LOL

  2. #17
    Join Date
    Feb 2003
    Location
    Little Rock, AR.
    Posts
    825
    Quote Originally Posted by mwezell View Post
    But, a barrel is not a guitar string...It's only attached at one end, making it a cantilevered beam. You can not physically move a NODE to the end of a barrel...err cantilevered beam. You can put the ANTI-NODE there.

    The anti node is in fact the point where the top and bottom of a sine wave occurs. A node is in between the top and bottom anti-node and is where the most movement occurs, fastest....angularly.

    Just imagine the barrel moving up and down, with some round-n-round thrown in. With a node being between the top and bottom anti-node, which do we want the bullet to exit the muzzle...the one at either end or the one in the middle? I want mine to exit just prior to the vertical apex of the barrell's oscillation.

    I'm aware of tuners and that some extend beyond the muzzle. Some claim that's how a "node" gets moved to the muzzle. If that were how tuners work, a behind the muzzle tuner would NOT work...but they do.

    There is no such thing as a "stopped muzzle"...that's just a physical impossibility, but there are areas where the muzzle moves less, at top and bottom.

    Again, a NODE can not be moved to the end of a cantilevered beam of a given length
    True, a node cannot be moved to the end of a cantilevered beam, but it can be moved to the crown of the barrel. As for the behind the muzzle tuners, they work by changing the amount of displacement that gets propagated to the muzzle by adding mass and inertia to the mid anti-node.

  3. #18
    Join Date
    Jul 2005
    Posts
    482
    Quote Originally Posted by Vibe View Post
    True, a node cannot be moved to the end of a cantilevered beam, but it can be moved to the crown of the barrel. As for the behind the muzzle tuners, they work by changing the amount of displacement that gets propagated to the muzzle by adding mass and inertia to the mid anti-node.
    It actually can be.

    You need a weight at the very end of the beam.
    Like a tuner.

    It is often larger than bore diameter on the inside.
    The node will than be at some distance BEHIND the additional weight.

    By moving the weight you can make the node appear at the end of the barrel bore.

    Years ago I had an older F150 pickup with an actual fender mounted antenna.
    The tiny ball on the antenna tip moved the vibration node to about 1 inch down on the antenna.

    In a light rain you could clearly see the node as the raindrops struck the antenna.

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