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1问:编辑同志,我们在学习和执行JJG116-83平尺检定规程中,有点不清楚的问题请解答。即,对于铸铁平尺,JJG116-83第7条规定了工作面直线度的检定,为什么第6条还要规定接触斑点的检定呢? (江苏省王方) 答:有不少同志也来信提出过这一问题,在此我一并回答。检定规程中第六条规定接触斑点的检定,其目的有两个,一是检验平尺工作面的微观质量,即微小峰谷的不平度,保证平尺的使用寿命;二是防止平尺工作面有小范围的局部畸变,由于用现有量仪检定平尺工作面直线度时,都是采用节距法,按一定的跨距进行检定,受检点是有限的,因此须补充接触斑点的检
1 Q: Editor comrades, we learn and implement JJG116-83 flat-foot test procedures, a little unclear questions, please answer. That is, for cast iron flat ruler, JJG116-83 Article 7 provides for the calibration of the face straightness, why article 6 also provides for contact spot test? (Jiangsu Province, Fang Fang) A: Many comrades also letter I have to answer this question before. Test procedures for the provisions of Article VI contact speckle, the purpose of two, one is to test the micro-quality flat-foot face, that is, the peak of uneven roughness to ensure the life of flat-foot; the second is to prevent the flat-foot work Surface has a small range of local distortion, as measured by the existing flat-foot face straightness, are using the pitch method, according to a certain span of test, the test point is limited, it is necessary to add contact spots Checked