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Rifles, Reloading, Optics, Equipment
Gunsmithing
?To nut or not to nut?
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<blockquote data-quote="Trickymissfit" data-source="post: 427115" data-attributes="member: 25383"><p>talk about the pot calling the kettle black!</p><p> </p><p>There was a small error in your post that really needs to be rectified. The reason the thread would normally be put in a stretched position is to make it strait and stress it to the point that it is ridgid. In otherwords your stressing the thread to create a condition that in this case is conductive to ridgitity. The practice is not new, and is rather common in the machine tool industry as well as super precision gauging. The stretched thread here just happens to be there, and to the shooter's benifit.. Once again full contact of any thread is impossible, and cannot see any argument there. But to make the first series of threads come into contact with the female as well as the last set puts you a leg up. And then to literally force things together under a predetermined stress just helps the situation.</p><p> </p><p>** the nut is under compression once it's put under torque. The barrel threads are stressed, and tus stretched to make full contact. If you had read my previous posts with an open mind you'd have picked up on the fact. Not alot of stress, but enough to matter. When you seat the shoulder, you really have no accurate way of controlling thread contact. Certainly you are tight at the shoulder, but are you tight 1/2" into the thread? Even a quarter inch into the thread? You just don't know and your guessing. There is no guess in a stretched thread; otherwise nobody would bother to use the concept. You once spoke of a 95% thread contact, and I'll give you that. Have you ever calculated the stated clearence. Kinda scarey isn't it? I suspect you really talking something like 99% or better, and I suspect it was just hitting the wrong key that day. But it dosn't matter anyway. You stated you don't have 100% thread contact. A thread with 99.5% contact will still have about .005" clearence on a 1.050-20 thread, but I guess you could be very carefull and get the end play down to about .0025. So yet get it down to .0025", and manage to thread the parts together without damage to the thread form. You got a near perfect thread going into a near perfect female thread (we all know better than that). After the shoulder is seated and maybe has 120 ft. lb. of torque (bringing in an undiscussed problem); how does one secure the barrel thread in the action? Or better said how does one controll what goes on inside the reciever bridge? You have no controll, and only hope for the best! In otherwords you probably have a half inch of barrel thread hanging out there doing nothing. </p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 427115, member: 25383"] talk about the pot calling the kettle black! There was a small error in your post that really needs to be rectified. The reason the thread would normally be put in a stretched position is to make it strait and stress it to the point that it is ridgid. In otherwords your stressing the thread to create a condition that in this case is conductive to ridgitity. The practice is not new, and is rather common in the machine tool industry as well as super precision gauging. The stretched thread here just happens to be there, and to the shooter's benifit.. Once again full contact of any thread is impossible, and cannot see any argument there. But to make the first series of threads come into contact with the female as well as the last set puts you a leg up. And then to literally force things together under a predetermined stress just helps the situation. ** the nut is under compression once it's put under torque. The barrel threads are stressed, and tus stretched to make full contact. If you had read my previous posts with an open mind you'd have picked up on the fact. Not alot of stress, but enough to matter. When you seat the shoulder, you really have no accurate way of controlling thread contact. Certainly you are tight at the shoulder, but are you tight 1/2" into the thread? Even a quarter inch into the thread? You just don't know and your guessing. There is no guess in a stretched thread; otherwise nobody would bother to use the concept. You once spoke of a 95% thread contact, and I'll give you that. Have you ever calculated the stated clearence. Kinda scarey isn't it? I suspect you really talking something like 99% or better, and I suspect it was just hitting the wrong key that day. But it dosn't matter anyway. You stated you don't have 100% thread contact. A thread with 99.5% contact will still have about .005" clearence on a 1.050-20 thread, but I guess you could be very carefull and get the end play down to about .0025. So yet get it down to .0025", and manage to thread the parts together without damage to the thread form. You got a near perfect thread going into a near perfect female thread (we all know better than that). After the shoulder is seated and maybe has 120 ft. lb. of torque (bringing in an undiscussed problem); how does one secure the barrel thread in the action? Or better said how does one controll what goes on inside the reciever bridge? You have no controll, and only hope for the best! In otherwords you probably have a half inch of barrel thread hanging out there doing nothing. gary [/QUOTE]
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?To nut or not to nut?
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