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选择相应刻度值的量具量仪,进行机械零件的尺寸测量时,一定不要忽视其量具量仪本身的误差。这一点极为重要。众所周知,没有误差的绝对真值是不存在的。因此,量具量仪本身也存在一定的误差。在制造过程中,是按照量具量仪公差来加工的,不过它的公差与一般零件的公差相比要小的多。国标中规定,IT01-IT7一般用于量规公差和相当的线值测量器具。不同精度等级的量具量仪,它的误差是不等的。在进行尺寸测量时,必须根据工件的尺寸公差,合理选用相应刻度值的
Select the appropriate scale value gage, the size of the mechanical parts measurement, we must not ignore the error of the gage itself. This is extremely important. As we all know, there is no absolute value of error does not exist. Therefore, the measuring instrument itself there are some errors. In the manufacturing process, it is processed according to the gauge gauge tolerance, but its tolerance is much smaller than the tolerance of common parts. National standard stipulates that IT01-IT7 is generally used for gauge tolerances and equivalent line measuring instruments. Different levels of accuracy gauge, its error is not the same. In the measurement of size, the workpiece must be based on dimensional tolerances, the appropriate choice of the appropriate scale value