Iron parts measurement
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Each time a furnace column spring is measured by different people, the measurement results will be different. The disparity is still a bit big. Do you have any measurement standards for iron parts?
It is stipulated that a unified marking point should be measured, and the backing plate should be measured together with the backing plate during measurement. The impurities on the outside of the backing plate should be cleaned before measurement, so that it is convenient to read the ruler, and then the thickness of the backing plate can be subtracted uniformly.