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Rifles, Reloading, Optics, Equipment
Reloading
Ladder Test Question ???
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<blockquote data-quote="Bart B" data-source="post: 96925" data-attributes="member: 5302"><p>Here's some data I got using a barrel vibrating software program that calculates the resonant (fundamental) frequency of a barrel. It was written by a mechanical engineer who own a business that deals in vibrating frequencies of materials for civil engineers and architects. He guaranteed accuracy to 2 decimal places based on the rigidity characteristics of both type 416 stainless and 4140 chrome moly which are typical of barrel steels used today.</p><p></p><p>I entered dimensional data for a stainless steel 30 caliber barrel 26 inches long with a 1.2-inch diameter reinforce 3 inches long at the rear then tapering to a muzzle diameter of both .700- and .900-inch. Also, I used a stand alone barrel with both breech and muzzle ends free and a barrel fixed at the breech end with the muzzle free. The results in each barrel's fundamental (natural resonant) frequency plus its weight are as follows:</p><p></p><p>.700-inch muzzle, 5.114 pounds; both ends free = 278.9 Hz, breech fixed = 70.7 Hz</p><p></p><p>.900-inch muzzle, 6.064 pounds; both ends free = 295.3 Hz, breech fixed = 60.6 Hz</p><p></p><p>Interesting stuff indeed.</p></blockquote><p></p>
[QUOTE="Bart B, post: 96925, member: 5302"] Here’s some data I got using a barrel vibrating software program that calculates the resonant (fundamental) frequency of a barrel. It was written by a mechanical engineer who own a business that deals in vibrating frequencies of materials for civil engineers and architects. He guaranteed accuracy to 2 decimal places based on the rigidity characteristics of both type 416 stainless and 4140 chrome moly which are typical of barrel steels used today. I entered dimensional data for a stainless steel 30 caliber barrel 26 inches long with a 1.2-inch diameter reinforce 3 inches long at the rear then tapering to a muzzle diameter of both .700- and .900-inch. Also, I used a stand alone barrel with both breech and muzzle ends free and a barrel fixed at the breech end with the muzzle free. The results in each barrel’s fundamental (natural resonant) frequency plus its weight are as follows: .700-inch muzzle, 5.114 pounds; both ends free = 278.9 Hz, breech fixed = 70.7 Hz .900-inch muzzle, 6.064 pounds; both ends free = 295.3 Hz, breech fixed = 60.6 Hz Interesting stuff indeed. [/QUOTE]
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Ladder Test Question ???
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