copper crusher pressure

copper crusher pressure

the cylindrical pressure measurement used by ballistic test laboratories to measure the chamber pressure generated when a caltridge is fired and served as the firing-pin indent crusher used for testing centerfire firearms.

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A soft copper rod (crusher) sits atop the piston and is restrained by an anvil. When the cartridge fires, pressure pierces the case and drives the piston into the copper crusher. This force shortens the crusher and the length is measured.

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Home Products & Services Ballistic Equipment for Testing of Cartridges Equipment According to Military Standards Copper crushers crusher pressure gauges. Copper crushers crusher pressure gauges. Crusher types. Cylinders. 3/4,9 ; 4/6 ; 4/6,5 ; 5/7 ; 5/8,1 ; 6/9,8 ; 8/13 ; Z1 threaded pressure gauges. Piston diameter. O3,91 mm ; O5,05 mm ; O6,18 ...

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of chamber pressure. Before about the 1960's the only measurement system we had for chamber pressure was the copper crusher method. Up until that time, what we now call CUP was commonly known by two different names: CUP and PSI. The two were used practically interchangeably. Of course, this use of PSI was incorrect. It wasn't much of a

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Feb 03, 2017 The copper-crusher measuring system serves this purpose for both 22 and larger-caliber ammunition. Major Rodman an American army officer and renowned Swedish chemist Alfred Nobel developed the copper-crusher pressure-measuring system in the mid-1800s simultaneously. Rodman’s invention, the crusher system, is still in use.

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Jan 04, 2011 Pressure against the piston shortens the crusher. We measure the crusher and consult a table of pressure values provided with each crusher lot. Starting at 0.499 inch, the table lists decreasing lengths in thousandths of an inch and, beside each length, the pressure in copper units of pressure (CUP) that it takes to shorten that much.

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Copper Crushers Gaug. Copper units of pressure or CUP and the related lead units of pressure or LUP are terms applied to pressure measurements used in the field of internal ballistics for the estimation of chamber pressures in terms were adopted by convention to indicate that the pressure values were measured by copper crusher and lead crusher gauges respectively

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Dec 26, 2018 CUP - Copper Units of Pressure. In this pressure measuring technique a hole is drilled in the chamber and a piston fitted that presses on a calibrated copper slug (or crusher). (Some set ups also drill the cartridge case which changes the results compared to non-drilled cases.) The whole assembly is held in place with a yoke.

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Feb 19, 2008 Perhaps the copper crusher pressure translates to the 8900 psi by piezoelectric, but as mentioned there is no hard and fast rule for converting between the different measuring methods. Their walls are built of cannonballs, their motto is Don't tread on me. Save Share. Reply. F.

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Recent testing of the M-11 Copper Crusher gage indicates that it does not meet the NATO standards for precision at the high end of its operating range. The Ballistic Research Laboratory BRL, of the Armament Research and Development Command ARRADCOM, at the request of the Materiel Testing Directorate MTD, of the Test and Evaluation Command TECOM, performed structural integrity analyses using ...

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Jun 16, 2017 Gauging CUP and LUP units is done with a special crusher gun, which uses pressure applied to a piston to crush a carefully calibrated copper or lead cylinder. The amount of crushing is compared to other crushing produced by different pressures in pounds per square inch.

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Gun chamber pressure is an important parameter in proofing of ammunition to ensure safety and reliability. It can be measured using copper crushers or piezoelectric sensor. Pressure calculations in copper crusher method are based on linear plastic deformation of copper after firing. However, crusher pressure deformation at high pressures deviates from the corresponding values measured by ...

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Copper Crushers Crusher. Crusher type pressure gauges are used to determine the maximum pressure in the barrel, or in a ballistic bomb, during a ballistic test. List of types offered: cylinder crushers, Conical crushers Pressure Gauge.

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Because the indicated pressure from crushers is known to be off, SAAMI many decades ago began referring to the indicated pressure from their tests as Copper Units of Pressure, a clumsy name commonly shortened to CUP. For low pressure cartridges such as shotshells, lead is used for the crusher, and SAAMI refers to these numbers as LUP.

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Jan 19, 2013 Copper units of pressure – Wikipedia, the free encyclopedia. A chamber pressure measured with a copper crusher gauge would be expressed as psi … For example, the SAAMI maximum pressure for the 7.62 x 51 mm is given as … More detailed

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When the gun is fired the copper pellet is crushed (deformed) by the pressure to some degree. The amount of this deformation is then precisely measured and a very standardized indication of pressure is determined. To this day, most published chamber pressure (MAP) data for metallic cartridges is taken by the copper crusher method of measurement.

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Currently, only two copper crushers – 0.146 x 0.400 inch and 0.225 x 0.500 inch – are specified for pressure testing. The difference in crusher-bar length before and after firing is measured and then converted mathematically to a pressure, in units of CUP (copper units of pressure).

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