论文部分内容阅读
以合象水平仪的底座(约为166毫米)或准直光管的反射镜(底长约100毫米)为检定平板平面度的桥板,对不同规格的平板进行各截面不直度检定时,实践告诉我们,受检间隔受到很大限制,受检点数不定,致使各截面线首尾不能相接,对角线与两根中线不能大约相交于一点,因此对测定和计算都有很大影响。特别是检定大平板,更麻烦费时,又不科学。再则,对于每一块平板在对角线与两中线的截面上,在规定其相同受检点数时(例如对于尺寸大于400×400的平板检8个截面25个点,即每个截面检5个点),它们的两点间的间距是各不相同的。如每一不同间距做一
In order to test the level of the base (about 166 mm) or collimating light tube mirror (the bottom length of about 100 mm) for the flatness of the bridge test plate, flat for different specifications of the cross-section straightness test, Practice tells us that the test interval is greatly restricted, subject to check the number of uncertainties, resulting in cross-section line can not meet the end, the diagonal and the two center lines can not be about to meet at one point, so the measurement and calculation have a great impact. In particular, test large flat, more troublesome and time-consuming, unscientific. In addition, for each plate in the diagonal and two midline cross-section, in the provisions of the same number of points to be checked (for example, the size of more than 400 × 400 flat panel inspection 8 sections 25 points, that is, each section inspection 5 A point), their spacing between the two points are different. Such as one for each different spacing