A morning check zeroed a micrometer and a chip was on the anvil. An hour of parts were accepted. The chip was found at break. The parts are in a tray mixed with yesterday's.
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Isolate the tray from the hour in question. Rezero on a clean standard and remeasure a sample from that hour, not the whole week's output, unless the sample is bad.
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If the sample moved by the chip, measure the hour. If it did not, you learned the zero was lucky. Either way the anvil gets wiped before a zero, every time, because this is how a day of parts becomes a guess.
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Yesterday's parts stay accepted unless they were in the same unchecked pile. Do not expand a one-hour problem into a plant shutdown without a sample.
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