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Rifle assembly
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<blockquote data-quote="buzzgun" data-source="post: 148449" data-attributes="member: 6372"><p>[ QUOTE ]</p><p>Buzzgun,</p><p></p><p>A press fit introduces stresses in the metal and those stresses will increase and decrease as the metal heats up and cools down, therefore, probably causing more inconsistencies. Inconsistencies and accuracy don't work well together. </p><p></p><p>I'm not a machinist but I have designed enough parts to feel that a quality thread would be better. If the barrel's center axis is not right in line with the action then your not going to shoot straight. One reason that comes to mind would be that you could ream the chamber and make the threads without having to take the barrel out of the lathe. Reducing the amount of operations usually allows for tighter tolerances. </p><p></p><p>[/ QUOTE ]</p><p></p><p>Thanks Cruzin</p><p></p><p>Are you saying that a threaded joint expands and contracts less than a press fit joint???? Are you saying a threaded joint doesn't induce stress that increases and decreases as the metal heats and cools???</p><p></p><p>Doesn't the coefficient of expansion of a material remain the same regardless of the shape of the object??? </p><p></p><p>Maybe you are saying that the clearance on the threads gives the barrel expansion somewhere to go??? If so, I don't understand how that could happen since a threaded joint has zero clearance on at least part of the thread.</p><p></p><p>As far as the barrel's center axis not being right in line with the action, how will cutting threads on the barrel shank provide a better center axis alignment than a shank turned to a precise press fit??? I understand that you can ream the chamber and cut the threads at the same time....are you suggesting that you can't ream the chamber and turn the shank to finished diamter at the same time too??? Whats the difference??? If you have to turn the barrel shank to the proper diameter before threading, how is it that leaving it unthreaded would cause the barrel center axis to be out of line with the center of the receiver???</p><p></p><p>If reducing the amount of operations allows for tighter tolerances.......then wouldn't eliminating the threading operation allow for a tighter tolerance??? </p><p></p><p>How can a threaded joint, which MUST have clearance to work, be more precise than an interferrence fit that has zero clearance???? </p><p></p><p>Just thinking outside the box.......</p></blockquote><p></p>
[QUOTE="buzzgun, post: 148449, member: 6372"] [ QUOTE ] Buzzgun, A press fit introduces stresses in the metal and those stresses will increase and decrease as the metal heats up and cools down, therefore, probably causing more inconsistencies. Inconsistencies and accuracy don't work well together. I'm not a machinist but I have designed enough parts to feel that a quality thread would be better. If the barrel's center axis is not right in line with the action then your not going to shoot straight. One reason that comes to mind would be that you could ream the chamber and make the threads without having to take the barrel out of the lathe. Reducing the amount of operations usually allows for tighter tolerances. [/ QUOTE ] Thanks Cruzin Are you saying that a threaded joint expands and contracts less than a press fit joint???? Are you saying a threaded joint doesn't induce stress that increases and decreases as the metal heats and cools??? Doesn't the coefficient of expansion of a material remain the same regardless of the shape of the object??? Maybe you are saying that the clearance on the threads gives the barrel expansion somewhere to go??? If so, I don't understand how that could happen since a threaded joint has zero clearance on at least part of the thread. As far as the barrel's center axis not being right in line with the action, how will cutting threads on the barrel shank provide a better center axis alignment than a shank turned to a precise press fit??? I understand that you can ream the chamber and cut the threads at the same time....are you suggesting that you can't ream the chamber and turn the shank to finished diamter at the same time too??? Whats the difference??? If you have to turn the barrel shank to the proper diameter before threading, how is it that leaving it unthreaded would cause the barrel center axis to be out of line with the center of the receiver??? If reducing the amount of operations allows for tighter tolerances.......then wouldn't eliminating the threading operation allow for a tighter tolerance??? How can a threaded joint, which MUST have clearance to work, be more precise than an interferrence fit that has zero clearance???? Just thinking outside the box....... [/QUOTE]
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