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Generally, the two-dimensional decimal point has 3 digits in the metric system and 4 digits in the imperial system. The problem you mentioned is not an equipment problem. There is such a problem in the second dimension, and the caliper has such a problem. This is just a matter of measurement method. It is called repeatability in measurement system analysis (MSA). Because the products made (whether plastic parts or stamping parts) have shrinkage deformation and draft angle, so the position is different, and the size is of course different. Considering the requirements of actual assembly, there is a concept called the maximum and minimum boundary. For holes, we focus on the minimum boundary, and for columns and shapes, we focus on the maximum boundary. So first determine what size you are concerned about to determine the position you are measuring. Parts produced at different times are measured by different people and choose the same position to record the data. Otherwise, the measurement loses its meaning. The measurement work is just the so-called difference. Different placement methods of parts, different positions, and incorrect understanding of the drawings will all affect the deviation of the measurement results. The accuracy of the equipment can be guaranteed, but the method of the personnel cannot be guaranteed. Therefore, prior training is a necessary means to improve measurement accuracy and data deviation.
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