The multiple motion errors duringcircular interpolation of NC machine tools can be obtained by using double ball bar tester.

可用双球规测量装置测得数控机床圆弧插补运动的综合误差。

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It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

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Using two curves around the double Ball point to approach two given lines with 3 order precision is realized, which solves the problem of double straight line synthesis.

运用双重鲍尔点附近的两段曲线来逼近给定的两段直线，其逼近精度为3阶。

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The U.S.sealed the victory in the 72nd minute through Clint Dempsey, who pounced on a loose ball in front of the Spanish net and deposited it in the goal to double the American lead.

VOA: standard.2009.06.24

Matthews made a superb double save before the ball fell to Lecky in the six-yard box and the striker poked into the net.

BBC: Lisburn Distillery 0-3 Portadown

Steve McKimm's cross found Jimmy Jackson, who made no mistake to fire the ball home and double Gravesend's advantage.

BBC: Yeovil 2-2 Gravesend

Lee Westwood whiffed a shot on his opening hole then his club nicked a pine tree on his downswing and the club went nearly a foot past the ball, leading to double bogey.

NPR: Stormy Round At Players For Tiger And Sergio