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1. The Trouble with a Batch: 1 Piece or 8 Defects? In the inspection records of a coating workshop, there was such a lin…
1. Reviewing the Scene: Two Conflicting Numbers A process capability review at a precision stamping factory. On the proc…
A car parts company received a quality agreement from a customer: batches with a nonconforming product rate exceeding 1.…
In the inspection records of a machine processing plant, a part with an outer diameter of 10.048 mm was marked as "confo…
1. A Workshop Where "Control Charts Have Been Drawn for Three Years" In the spring of 2026, I witnessed a scene at a pre…
A quality engineer at a plastic injection molding company spent three weeks conducting a round of DOE, involving three f…
A quality engineer at a die casting company conducted a gauge repeatability and reproducibility GR&R study, calculating …
When submitting PPAP for a new project, the measurement system section typically includes three GR&R reports, with %GRR …
A quality engineer in a heat treatment workshop has been staring at a "control chart that doesn't look like a control ch…
When it comes to SPC control charts, most workshops immediately think of the X̄ R chart: measuring dimensions, torque, a…
1. Parameters Copied Word for Word, but the Third Machine Produces a Batch of Cold Welds A manufacturing company's weldi…
1. Treating Formulas as Ordinary Factors, 27 Trials Yielded Only Waste Data A manufacturing company sought to improve th…