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Rifles, Reloading, Optics, Equipment
Reloading
Overpressure Signs ?
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<blockquote data-quote="Clark" data-source="post: 952193" data-attributes="member: 6600"><p>I do not use strain gauges on rifles.</p><p>My father used one on the M107 artillery design, not for pressure during firing, but to tell if the round was loaded properly.</p><p></p><p>I have plenty of CEA-O6-250UW-350 strain gauges and I have designed much better instrument amplifiers than the ones Oehler sold. But that is not to say I waste my time reading my storage scope instead of my brass.</p><p></p><p>The problems that are insurmountable with strain gauges are:</p><p>1) The absolute pressure does not matter in the quest for finding the limit of the weak link, brass.</p><p>2) The absolute pressure is hard to measure</p><p>...a) We cannot mount the strain gauge accurately</p><p>...b) The Roark equations for stress vs strain in the complex shape of an open ended tube are almost insurmountable</p><p>...c) The error calculation in traceability to NIST is nearly impossible, making absolute measurements meaningless.</p></blockquote><p></p>
[QUOTE="Clark, post: 952193, member: 6600"] I do not use strain gauges on rifles. My father used one on the M107 artillery design, not for pressure during firing, but to tell if the round was loaded properly. I have plenty of CEA-O6-250UW-350 strain gauges and I have designed much better instrument amplifiers than the ones Oehler sold. But that is not to say I waste my time reading my storage scope instead of my brass. The problems that are insurmountable with strain gauges are: 1) The absolute pressure does not matter in the quest for finding the limit of the weak link, brass. 2) The absolute pressure is hard to measure ...a) We cannot mount the strain gauge accurately ...b) The Roark equations for stress vs strain in the complex shape of an open ended tube are almost insurmountable ...c) The error calculation in traceability to NIST is nearly impossible, making absolute measurements meaningless. [/QUOTE]
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Overpressure Signs ?
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