Apply control-chart rules to decide whether wall-thickness variation needs investigation or routine monitoring.
Wall-thickness values remain in specification, but seven consecutive points sit above the centerline after a job setup. Control chart reaction: confirm signal -> verify measurement -> link timing -> act on evidence The common trap is adjusting a forming variable just because the trend makes people uncomfortable, even when the signal has not been interpreted. Read the chart rule Seven points above centerline suggest a nonrandom run worth investigating. The product can be in spec while the process shows a special-cause pattern. Check measurement Confirm gauge setup, sampling method, and operator entries before treating the trend as process movement. A…
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