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在万能工具显微镜(或工具显微镜、投影仪等,以下简称万工显),用极坐标或直角坐标测量某些小零件,如小模数齿轮,凸轮,样板等零件时,常常要求在工作台上放置被测件时,必须使被测工件中心孔的中心 Or 严格地与仪器圆工作台的回转中心 O_台相重合,如图1所示。然后再进行各项测量。这种工作我们称之为“定中心”。由于工件内孔中心,往往是测量的基准,因此定中心的精度如何将直接地影响测量结果的精确度。
In the omnipotent tool microscope (or tool microscope, projector, hereinafter referred to as Wan Gongxian), polar coordinates or Cartesian coordinates measuring some small parts, such as small modulus gears, cams, templates and other parts, often required on the workbench When placing the device under test, the center Or of the center hole of the workpiece under test must be exactly coincident with the center O_ of the rotary table of the instrument round table, as shown in Figure 1. Then make all the measurements. We call this kind of work “centering.” Since the center of the hole in the workpiece is often the basis of the measurement, the accuracy of the centering will have a direct impact on the accuracy of the measurement results.