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正多面棱体(以下简称棱体)是目前测量圆分度误差的常用标准计最器具之一。它以严格的几何形状误差(如工作面平面度、工作面对定位面的垂直度、工作面的表面粗糙度及工作角偏差等)保证其准确分度。通常使用中工作角偏差可按检定结果予以修正。因此,其它各项就成为影响分度精度的因素,而其中工作面平面度尤为突出。测量棱体工作角时,以自准直仪照准各工
Positive polyhedral prisms (hereinafter referred to as Prism) is one of the most commonly used standard instruments for measuring graduation error of circles. Its strict geometric error (such as face flatness, the work of the positioning of the vertical surface, the work surface roughness and angle deviation, etc.) to ensure its accurate indexing. In normal use, working angle deviation can be corrected according to test results. Therefore, all other factors have become the factors that affect the accuracy of indexing, and the working face roughness is particularly prominent. When measuring the working angle of prism, take self-collimator to approve each work