In production, we have to test a spring with a small stiffness, the load value is only 12 ± 1.2g. The minimum value of the general spring test machine is also 5g, so the test encounters difficulties. We later came up with a method of measuring with a balance, which worked well. The accuracy is also high, only the balance of the tray, the ruler, and the flat plate are required. Methods as below:
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