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Rifles, Reloading, Optics, Equipment
Gunsmithing
Savage action accurate ?
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<blockquote data-quote="Trickymissfit" data-source="post: 505885" data-attributes="member: 25383"><p>once again, if the thread is tightened on a shoulder not all the thread will be in tension. It's physics, and cannot be avoided with a ground thread (internal and external both). To seriously make a barrel as stiff as some folks think it is, the 1.25" end would have to be a minimum of 25% of the barrel length (once again physics) unless the complete barrel length was bedded (won't work as we all know by now). Secondly the 3/4" or so of barrel threads is not nearly enough to support the leverage of a heavy barrel that is 26" or more in length (Applied Mechanics 101). Even a barrel nut will not do this 100% (maybe 75%). A barrel nut pulls the threads forwards into complete contact with the female thread form while keeping the male thread in tension. This is known as "stretching the thread." A common practice is super precision thread applications. If you were to thread the muzzel and slip a tube over the barrel you would probably achive 90%+ support, as well as greatly increasing rigidity.</p><p> </p><p> Bench rest shooters like to use barrels in the 21" to 22" range because they are far more rigid (70% don't know this), and to make weight. The 3/4" of threads have an easier time supporting the leverage of the barrel hanging out there. If you make a mechanical drawing of the bolt to barrel assembly and put a 60K psi thrust on it in all directions you will see the barrel thread go all over the place with a shoulder lockup. The nut will also move a certain amount, but the difference is a fraction of the amount the shoulder lockup has as it's unsupported for most part.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 505885, member: 25383"] once again, if the thread is tightened on a shoulder not all the thread will be in tension. It's physics, and cannot be avoided with a ground thread (internal and external both). To seriously make a barrel as stiff as some folks think it is, the 1.25" end would have to be a minimum of 25% of the barrel length (once again physics) unless the complete barrel length was bedded (won't work as we all know by now). Secondly the 3/4" or so of barrel threads is not nearly enough to support the leverage of a heavy barrel that is 26" or more in length (Applied Mechanics 101). Even a barrel nut will not do this 100% (maybe 75%). A barrel nut pulls the threads forwards into complete contact with the female thread form while keeping the male thread in tension. This is known as "stretching the thread." A common practice is super precision thread applications. If you were to thread the muzzel and slip a tube over the barrel you would probably achive 90%+ support, as well as greatly increasing rigidity. Bench rest shooters like to use barrels in the 21" to 22" range because they are far more rigid (70% don't know this), and to make weight. The 3/4" of threads have an easier time supporting the leverage of the barrel hanging out there. If you make a mechanical drawing of the bolt to barrel assembly and put a 60K psi thrust on it in all directions you will see the barrel thread go all over the place with a shoulder lockup. The nut will also move a certain amount, but the difference is a fraction of the amount the shoulder lockup has as it's unsupported for most part. gary [/QUOTE]
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Savage action accurate ?
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