We have an application where a helical compression spring is used in clamping application for an industrial robot. We found that the clamping load was dropped in about 30% in just 6 months. The temperature around the spring should not be higher than 70C. We verified the spring provided by the supplier is below stated load value given in the drawing. Unfortunately, there is no requirement given in the drawing to specify the relaxation requirement. I am planning to add the relaxation requirement (e.g. 3% in 2 years) in the drawing to make sure the next batch delivery to be problem free. I would appreciate if someone can provide recommendations for what kind of test the vendor can perform to substantiate the conformance.
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