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编辑同志: 被测尺寸链为不封闭型工件牙距的累积误差·(如齿条、丝杆、蜗杆、螺纹刀量具等类型工件的螺距或牙距累积误差),在图纸中有两种给定法: (1)累积误差的极限偏差±a或任意两牙间的螺距偏差不大于±a; (2)累积误差不大于a。而在日常测试工作中,也有两种不同的测试方法: (1)测出其规定长度上的首尾两点的实际尺寸与公称尺寸之差; (2)在其规定的长度上逐齿测量、累积,最后取其偏差中的最大代数差。应当怎样正确理解图纸上给定的技术条件
Editor comrades: The measured size chain is the cumulative error of non-closed type tooth pitch (such as rack, screw, screwdriver measuring tools and other types of workpiece pitch or pitch cumulative error), there are two kinds of drawings Law: (1) the cumulative deviation of the deviation ± a or any two teeth pitch deviation is not greater than ± a; (2) the cumulative error is not greater than a. In the daily test work, there are also two different test methods: (1) Measure the difference between the actual size and the nominal size of the first two points of the specified length; (2) Measure the tooth length by its specified length, Cumulative, and finally take the deviation of the largest algebraic difference. How to correctly understand the technical conditions given on the drawings