How how do machine gun barrels get?

What's the temperature (°F) of a machine gun barrel after prolonged firing? Are there studies on it? Is there a average temperature range?

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  1. 1 month ago
    Anonymous

    hot

  2. 1 month ago
    Anonymous

    Machine guns do not do "prolonged firing" in any real life circumstance

    • 1 month ago
      Anonymous

      Oh they absolutly do, but not to the point that they glow red
      t. former machinegunner

      • 1 month ago
        Anonymous

        [...]
        Seconded. That "Short delayed bursts" is a training mindset. In an actual twoway live fire you send that shit.
        t. 249/mk48/m2 gunner circa 2009/2010

        >ywn fire a vickers gun for 5 days straight in the trenches of WWI
        :^(

        • 1 month ago
          Anonymous

          I hear scientists are really close to figuring out a time machine. You'll be able fulfill your dream of dying in a trench really soon

          • 1 month ago
            Anonymous

            >You'll be able fulfill your dream of dying in a trench really soon
            the afu is hiring

            • 1 month ago
              Anonymous

              this.
              hell, the vatniks are hiring as well. you have options.

    • 1 month ago
      Anonymous

      Oh they absolutly do, but not to the point that they glow red
      t. former machinegunner

      Seconded. That "Short delayed bursts" is a training mindset. In an actual twoway live fire you send that shit.
      t. 249/mk48/m2 gunner circa 2009/2010

  3. 1 month ago
    Anonymous

    Naturally, they will slowly approach the temperature of the exhaust gases produced by the deflagration of whatever specific propellent is being used. At the same time, they're also radiating heat and passing it off to the surrounding air by convection.
    If you want to spend an hour learning some basic thermodynamics, you could pretty easily get general estimates for a specifically sized barrel of a known alloy firing a certain number of rounds per minute, with a specific atmospheric temperature.

    • 1 month ago
      Anonymous

      While I'm no machinegunner by best guess would be once thermal expansion started to shrink the bore you get more friction heating, more thermal expansion more friction heating.
      There would be a point where the temp started to runway even ignoring cookoff making it belt dump on closed bolt MGs.

      • 1 month ago
        Anonymous

        Why do you think getting a tube hot makes the inside smaller

        That's not what happens

        • 1 month ago
          Anonymous

          >Why do you think getting a tube hot makes the inside smaller
          Because the walls expand in all directions don't they?
          Hang on, I'm a fricking idiot, I have literally heated bearings to get them on and off.
          I'll see myself out.

          • 1 month ago
            Anonymous

            the expansion is really really small. but it's enough with stuff like rusted bolts or tight fits because you only need a tiny gap to open.
            but yeah the hole does also get larger.

            > a steel post that is exactly 1 meter long at 0 C is 1.2 millimeters longer at 100 C. This seems negligible until we discover that it would take a 15 ton force to keep the post from expanding

            >If the ocean becomes 1 degree (F) warmer, its volume will increase by 0.01%. Since the ocean is several miles deep, this implies that the surface will rise about a foot, giving a change in the sea level. In the process, the beach line moves landwards 20 feet.

        • 1 month ago
          Anonymous

          It's pretty intuitive to assume that an expanding tube would close shut as the heat expansion occurs.
          I blame the 1-dimensional examples of heat expansion in school textbooks. It's always a bar of metal whose expansion is visually shown in a single direction.

    • 1 month ago
      Anonymous

      This is more specifically heat transfer then thermo

  4. 1 month ago
    Anonymous

    Yeah ºF
    Yeah DOIs/AD about internal ballistic
    Bruh

    Back of the napkin calculation with simplification should be enough for most whats:
    >Short burst at high ROF (no heat loss by radiation/conduction)
    >Barrel temperature is uniform
    >Heat from propellants is similar to muzzle energy of bullets (because it's like that irl https://en.wikipedia.org/wiki/Physics_of_firearms)
    >Specific heat of steel 0.5 J/(ºC.g), in globohomosexual units
    For a ~ 2Kg MG barrel (like the MG42/38) it's like 4ºC/7ºF per round. After 100-200 rounds it'll need a new barrel
    >2000 * 0.5 = 1000 J/ºC
    >4000 J muzzle energy -> ~4000 J barrel heat (total propellant energy ~12000 J)
    >4000/1000 = 4 ºC / rnd

    • 1 month ago
      Anonymous

      Doesn’t sound right. You’d have a better time finding Qdot from the expanding gasses and then setting that =kA(T2-T2)

      • 1 month ago
        Anonymous

        T2-T1*

  5. 1 month ago
    Anonymous

    Given an unlimited supply of ammunition it will keep heating up until it can't fire anymore, either because the metal expands too much and causes the mechanism to jam, or because it loses too much strength and causes the mechanism to break.

  6. 1 month ago
    Anonymous

    >How how do machine gun barrels get?
    ^the absolute state of this ESL board

    • 1 month ago
      Anonymous

      bro it's a one letter typo

  7. 1 month ago
    Anonymous

    A machine gun barrel will literally melt if you overuse it.

  8. 1 month ago
    Anonymous

    not very how

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