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McCarville & Montgomery

Graphical Optimization

When viewing the contour plot of the ppm(Def) model, it is obvious that there are an infinite number of possibilities to meet the corporate and customer requirement of 100 ppm defects. Achieving this could certainly be done by the trial and error method of guard banding. However, this would likely take considerable time and it is extremely unlikely that the minimum level of Gage Loss could be achieved. By overlaying the contour plots, optimum settings for the guard bands should quickly be found. Figurę 16 is the first attempt at finding the optimum graphically. By observing the contour plots of the models, a Gage Loss of 100,000 ppm was thought to be close to the right area. Figurę 17 is the second iteration with the Gage Loss set at 80,000 ppm. The finał iteration is shown in Figurę 18 with the minimum Gage Loss found to be 75,000 ppm or 7.5%. The optimal levels for GB1 and GB2 are 642 and 614 respectively.

Figurę 16. First Optimization Plot with the ppm(Def) Level Set at the Corporate Goal of 100 ppm and the Gage Loss Set at 100,000 ppm (10%

Yield Loss).

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