Direct-effect charts are the result of the experimental design described in Section 19.10.7. An example is shown in Figure 19.29. The example is for workpiece roughness in high-speed CBN grinding of AISI 52100. The results clearly show that high wheel speed reduces roughness.
A chart for grinding ratio is shown in Figure 19.30 for the same conditions as in Figure 19.29. Figure 19.30 shows that wear of the grinding wheel is greatly reduced by increasing wheel speed from 60 m/s to 120 m/s. This is correspondingly reflected by longer redress life as indicated in the following cost comparisons.
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FIGURE 19.31 Comparisons of cost per part and redress life when grinding AISI 52100 with different grinding wheels and grinding conditions.
19.10.11 Redress Life and Cost Comparisons