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Thread: Locking lug math help

  1. #1
    Gunco Rookie Warwickben's Avatar
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    Default Locking lug math help

    Looking at building a .50bmg bolt action using a interrupted thread style locking lugs.

    Looking at a Barrett bolt action gave me the idea.
    I figure it would be a lot easier todo then cutting a normal 2 or 3 lug setup

    I'm stumped on trying to figure out what size acme thread rod and how many threads to use.

    Any help would be great.

  2. #2
    Chief Administrator 7.62x39's Avatar
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    Back before he became a gentleman of leisure Winn was a structural engineer of some sort (we all remember the infamous toothpick experiment lol) He might be able help you out.
    Let's see if we can get him to chime in here.
    .

  3. #3
    GuncoHolic Sprat's Avatar
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    great idea

    please go to the new member section and introduce yourself
    Sprat and sprat1 are one and the same.

  4. #4
    gunco irregular moleman's Avatar
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    I know you mentioned in your other thread that you'd found acme thread and nuts in 4140, do you know what the RC is as it will make a difference.

  5. #5
    Indian Admin Winn R's Avatar
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    Quote Originally Posted by 7.62x39 View Post
    Back before he became a gentleman of leisure Winn was a structural engineer of some sort (we all remember the infamous toothpick experiment lol) He might be able help you out.
    Let's see if we can get him to chime in here.
    Well -- I was a little younger then and a whole lot stupider.

    In answer to the thread starter's question, It's all dependent upon the steel type and hardness. And not only of the bolt material but the receiver as well. There's a reason the ar uppers are $1000 plus and still report problems.

    Not meaning to be a smart ass, but if you've got to ask you shouldn't be doing it.
    There is no nonsense so errant that it cannot be made the creed of the vast majority by adequate governmental action. -- Bertrand Russell


    "Never attribute to malice that which can be adequately explained by stupidity." Robert J. Hanlon

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