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在零件的质量检验中,有人采用三用游标卡尺测量一些小孔(如5毫米左右)的孔径,本想测量准确,尽量用分度值为0.02毫米的卡尺,但检验结果很不理想,原来用游标卡尺测量小孔是不合理的,它的测量误差很大。大家知道,游标卡尺内量爪刀口有一定的厚度b,而且两量爪之间还有一定间隙 c,这样在测量小孔孔径时,卡尺的读数 d_读与孔径的真实值 d_实就不会一致,误差δ的大小可由下图关系得出:
In parts quality inspection, some people use three caliper to measure the number of holes (such as 5 mm or so) of the aperture, wanted to measure accurately, try to use the division value of 0.02 mm caliper, but the test results are not ideal, the original use Vernier caliper measurement hole is unreasonable, its measurement error is very large. We all know that the vernier caliper within the amount of prongs have a certain thickness b, and there is a certain gap between the two claws c, so in the measurement of aperture aperture, the caliper reading d_ reading and aperture of the actual value d_ really do not Will be consistent, the size of the error δ can be drawn from the following relationship: