Examples
Why Process Changes Become Quality Problems | Lab Wizard
Why Process Changes Become Quality Problems
A barrel plating shift supervisor notices the rectifier current dropped 8% during the first hour of a run. He adjusts the amperage, adds a chemistry check to the log, and calls it a minor fluctuation. Three hours later, another operator sees the same tank’s conductivity creeping upward by 2 mS/cm per hour. This time, he stops the line, pulls a test panel, and calls for a chemistry adjustment. The part brightness is still within spec, but the trend is directional and sustained. By the time the shift ends, a batch of connectors has plating thickness variation that passes lab tests but fails the customer’s visual inspection.
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Not All Process Changes Mean the Same Thing | Lab Wizard
The Operator’s Dilemma
A shift supervisor notices the cathode current density has shifted from 18.0 to 19.5 A/sq dm. The documented range is 16-22. The change is within spec.
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What a Real Process Signal Looks Like | Lab Wizard
What a Real Process Signal Looks Like
A plating bath stays within specification all week.
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