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在机械加工中,有很多小尺寸内圆孔的加工,其测量是一个很重要的环节。往往在加工小尺寸内圆孔时(<φ10mm以下),操作工人直接用分度值为0.02mm的游标卡尺刀口形内量爪进行测量和检验。他们本想使测量结果接近真值,但实际上测量误差是很大的,引起测量误差的原因有以下几个因素:一是游标卡尺检定规程中规定,刀口形内量爪尺寸在10mm时为10_(-0.01)~(+0.02)mm,即本身最大误差为δ_1=0.03mm,当测量小圆孔时,这个偏差不可忽
In machining, there are many small-size inner hole machining, the measurement is a very important part. Often in the processing of small-size hole (<φ10mm below), the operator directly with a divider value of 0.02mm vernier caliper knife-shaped internal mass claw to measure and test. They would like to make the measurement results close to the true value, but in fact the measurement error is very large, the measurement error caused by the following factors: First, vernier caliper test procedures specified in the knife-shaped inner jaw size 10mm (-0.01) ~ (+0.02) mm, that is, its own maximum error δ_1 = 0.03mm, when measuring small round hole, this deviation can not be ignored