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Rifles, Reloading, Optics, Equipment
Gunsmithing
Muzzle threading
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<blockquote data-quote="J E Custom" data-source="post: 1093984" data-attributes="member: 2736"><p>There are many things that could upset the muzzle of a barrel while/when threading or fitting a muzzle brake to it.</p><p></p><p>First the barrel must be is a state or stress relieve that makes the barrel material very stable.</p><p></p><p>Different ways of cutting the threads could effect the diameter of the threaded tenon. when rolled</p><p>threading is used(Lots of bolts are roll threaded)this could cause the diameter to change,</p><p></p><p>Using a die will also change the diameter if the wall thickness is minimum because of the inward force on the tenon from all of the cutters cutting at the same time. a proper Lathe cut thread should be stress free and should not cause any dimensional changes. Heat is always an issue and multiple</p><p>passes are the best way to avoid heating the tenon up.</p><p></p><p>There is another way to alter the bore diameter that is more common. When a muzzle brake or a barrel nut is installed on a marginally thin barrel wall as the brake is tightened it will reduce the bore diameter because if the 60o angle of the threads. to avoid this some smiths use Loctite and hand tight fit ups.</p><p></p><p>So in my opinion, if the barrel is properly stress relieved and threads are cut properly and the brake is installed properly there should not be any diameter changes to the bore.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1093984, member: 2736"] There are many things that could upset the muzzle of a barrel while/when threading or fitting a muzzle brake to it. First the barrel must be is a state or stress relieve that makes the barrel material very stable. Different ways of cutting the threads could effect the diameter of the threaded tenon. when rolled threading is used(Lots of bolts are roll threaded)this could cause the diameter to change, Using a die will also change the diameter if the wall thickness is minimum because of the inward force on the tenon from all of the cutters cutting at the same time. a proper Lathe cut thread should be stress free and should not cause any dimensional changes. Heat is always an issue and multiple passes are the best way to avoid heating the tenon up. There is another way to alter the bore diameter that is more common. When a muzzle brake or a barrel nut is installed on a marginally thin barrel wall as the brake is tightened it will reduce the bore diameter because if the 60o angle of the threads. to avoid this some smiths use Loctite and hand tight fit ups. So in my opinion, if the barrel is properly stress relieved and threads are cut properly and the brake is installed properly there should not be any diameter changes to the bore. J E CUSTOM [/QUOTE]
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Muzzle threading
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