Army develops new technique for rifling cannon bores
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The Army has developed a new technique for cutting rifled grooves inside 155mm howitzer barrels that officials say could extend cannon life, improve performance and reduce manufacturing costs.The process, demonstrated earlier this year at the Army’s Benét Laboratories in New York, uses electrochemical machining, or ECM, to carve the barrel’s 48 spiral grooves without the cutting tool ever touching the steel.Officials said the no-contact technique leaves the bore in ideal condition for bonding a
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