During the improvement project, the manufacturing company had developed a PAC called H-PAC to study
the performance of the paint application process and the process variations on a particular product. The PAC is a typical attribute chart; however, the values are derived from targets based on historical data. From the data collected during the improvement project, the top three defects were inclusions, under- or over-spray, and paint-run.
The product runs at a cycle time of 148 s for every two parts; hence 48 parts can be produced every hour. At the start, a ‘wrong first time (RFT)’ yield of 90% was set and the defective PAC was divided based on the 10% defects.
Every hour a chart was plotted for these three defects with a lower control limit of 0% and an upper control limit of
10%. When any of the defects went over the ‘upper control limit (UCL)’ in a particular hour, the production line
would be stopped for analysis. This technique improved the understanding of process variations and resolved some
possible causes for the defects.
During the improvement project, the manufacturing company had developed a PAC called H-PAC to study
the performance of the paint application process and the process variations on a particular product. The PAC is a typical attribute chart; however, the values are derived from targets based on historical data. From the data collected during the improvement project, the top three defects were inclusions, under- or over-spray, and paint-run.
The product runs at a cycle time of 148 s for every two parts; hence 48 parts can be produced every hour. At the start, a ‘wrong first time (RFT)’ yield of 90% was set and the defective PAC was divided based on the 10% defects.
Every hour a chart was plotted for these three defects with a lower control limit of 0% and an upper control limit of
10%. When any of the defects went over the ‘upper control limit (UCL)’ in a particular hour, the production line
would be stopped for analysis. This technique improved the understanding of process variations and resolved some
possible causes for the defects.
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