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使用内径百分表测量孔径时,一般在工厂中由于条件的限制,其测量尺寸常用外径千分尺来校对。但是,如果不注意千分尺的轴向间隙,而用轴向间隙过大的千分尺来校对内径百分表,就必然造成一定数值的校对误差,其测量结果不可靠。千分尺的轴向间隙对千分尺示值误差的影响不大,因此,它的数值往往超过示值误差的好几倍。例如,0.01毫米～0.02毫米的轴向间隙,用手不容易明显感觉出来,所以往往容易
When using the aperture dial indicator to measure the aperture, it is usually calibrated in the factory because of the limitations of the conditions. The measurement size is usually calibrated with an outer diameter micrometer. However, if you do not pay attention to the micrometer axial clearance, and the axial clearance is too large micrometer to calibrate the inner diameter dial gauge, it will inevitably result in a certain number of proofreading error, the measurement results are not reliable. The micrometer axial clearance has little effect on the indication error of the micrometer, so its value often exceeds the indication error several times. For example, an axial gap of 0.01 mm to 0.02 mm is not easily noticeable by hand and is therefore often easy