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在生产上我们常会遇到箱体零件有两个孔或两个以上的孔,这些孔需要在钻床或在镗床上加工,如图1所示。有人在设计、绘图时,未在孔的坐标尺寸上标注公差,却按自由公差来处理。我认为这种做法不妥,而应标注公差。因为,如欲得到较高级的孔中心距的精度,通常在坐标钻床或坐标镗床上按直角坐标系统进行加工。而在这些坐标钻、镗床上钻、镗孔时,都要根据这些坐标尺寸 X、Y 进行。如果孔的坐标尺寸不标注公差,就无法知道要达
In the production we often encounter the box parts have two or more holes, these holes need to drill or boring machine processing, as shown in Figure 1. Some people in the design, drawing, not in the coordinates of the hole size tolerances, but according to the free tolerance to deal with. I think this is not a proper solution, but should be marked with tolerances. Because, for more accurate hole center distance accuracy, usually in the coordinate drilling machine or coordinate boring machine Cartesian coordinate system for processing. In these coordinates drilling, boring machine drilling, boring, should be based on these coordinate dimensions X, Y carried. If the hole coordinate dimensions do not mark the tolerance, you can not know to be reached