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    Why flatness tolerance associated with a FOS must be less than the size tolerance?

    In my understanding, when a flatness tolerance is associated with a FOS, the Rule #1 is overridden and perfect form at MMC is removed. So, flatness tolerance associated with a FOS can be greater than the size tolerance. However, ASME Y14.5-2009 specified in section 5.4.2 that, with flatness of...

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