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无形圆直径的测量是在工厂生产过程中常遇到的测量问题。无形圆由于其无形而常被人认为不可测量甚至拒绝测量。无形圆是一个看不到它的全部形状而要测量其直径的一个圆。一、孔心等分分布时无形圆直径的测量例如:在一块圆板上有几个沿直径为d的圆周上分布的小孔如图1,这几个小孔圆心所通过的圆就称为无形圆。无形圆的圆心往往并不与零件外径圆的圆心相重合,一般尺寸在100毫米以下时可在万能工具显微镜或工具显微镜上进行,利用仪器的
Measurement of the diameter of the invisible circle is a measurement issue often encountered in the factory production. Invisible circles are often considered unmeasurable or even rejected because of their invisibility. An invisible circle is a circle whose diameter is not measured in its full shape. First, the center of the hole when the distribution of immaterial circle diameter measurement For example: in a circular plate along the diameter of d on the circumference of the distribution of small holes in Figure 1, these small holes through the center of the circle is called Invisible round. The center of the invisible circle often does not coincide with the center of the circle of the outer diameter of the part. When the general size is under 100 mm, it can be performed on a universal tool microscope or a tool microscope.