Read a control chart before touching the spinner
Use control chart thinking to decide whether yarn count variation needs investigation or routine monitoring.
The reframe: do not adjust a stable process because one number made you nervous. Specification is not stability Specification limits come from the customer or product requirement. Control limits come from the process history. A yarn count can be inside spec but still show a new pattern that deserves attention. It can also be outside a tight target once without proving the machine has changed. Signals beat opinions Look for a point outside limits, repeated points on one side of center, a steady trend, or a pattern tied to time, frame, operator, raw material, or environment. The point is not…
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