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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hand tight switch barrel accuracy?
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<blockquote data-quote="ntsqd" data-source="post: 2006331" data-attributes="member: 93138"><p>Vibration is vibration; duration, frequency and amplitude determine what the effects are going to be. Not so much the environment where it happens. So yeah, a bolt action rifle isn't an Infernal Combustion Engine (~10 years working in a racing engine machine shop myself), but that doesn't mean that the vibration it sees is any less important.</p><p></p><p>When I was in high school auto shop our instructor had the burliest guy in the class tighten all of the head bolts on one SBC cylinder head to 100 ft-lbs, as best as he could feel.</p><p>He then had a student observe a beam style torque wrench and call out the torque as he loosened each of the those bolts and another student wrote the numbers on the chalkboard. </p><p>They were nowhere close to consistent. My now ~30 years old memory of that demonstration is that the torque varied by ±20 ft-lbs. This was a demo that he did every semester, those threads were quite burnished by that point. There would not have been a large difference in all of the surface finishes to have effected the individual bolt's tightness.</p><p></p><p>His well made point was that you can not tighten by hand with any consistency. I'll go along with the idea that the more that a person does so, the better their consistency will become. But I won't go along with the idea that a person can consistently torque anything to within a specific torque with a narrow tolerance.</p></blockquote><p></p>
[QUOTE="ntsqd, post: 2006331, member: 93138"] Vibration is vibration; duration, frequency and amplitude determine what the effects are going to be. Not so much the environment where it happens. So yeah, a bolt action rifle isn't an Infernal Combustion Engine (~10 years working in a racing engine machine shop myself), but that doesn't mean that the vibration it sees is any less important. When I was in high school auto shop our instructor had the burliest guy in the class tighten all of the head bolts on one SBC cylinder head to 100 ft-lbs, as best as he could feel. He then had a student observe a beam style torque wrench and call out the torque as he loosened each of the those bolts and another student wrote the numbers on the chalkboard. They were nowhere close to consistent. My now ~30 years old memory of that demonstration is that the torque varied by ±20 ft-lbs. This was a demo that he did every semester, those threads were quite burnished by that point. There would not have been a large difference in all of the surface finishes to have effected the individual bolt's tightness. His well made point was that you can not tighten by hand with any consistency. I'll go along with the idea that the more that a person does so, the better their consistency will become. But I won't go along with the idea that a person can consistently torque anything to within a specific torque with a narrow tolerance. [/QUOTE]
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Hand tight switch barrel accuracy?
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