直线度公差是控制机械零件平面形状的一项重要技术指标。零件平面的精度不论高低,它的实际误差是必须测定的。只有知道了误差,才能判断其是否合格,才能进一步分析产生误差的原因,进而改变工艺文件或制订其修复方案。建筑机械在制造、安装和修理中,经常会遇到这个问题。测定直线度误差的方法有多种,近年来,有的书刊对各种方法均有论述。但由于内容广泛,新概念多,在实际测量中,对数据处 Straightness tolerance is to control the plane shape of mechanical parts is an important technical indicators. The accuracy of the part plane, regardless of height, its actual error must be determined. Only by knowing the error can we judge whether it is qualified or not, so as to further analyze the cause of error and change the process document or formulate its repair plan. Construction machinery in the manufacture, installation and repair, often encounter this problem. There are many ways to determine the straightness error. In recent years, some books and magazines have discussed the various methods. However, due to a wide range of content, new concepts and more in the actual measurement, the data at