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Six Sigma Projects and Personal Experiences Part 8

Tham khảo tài liệu 'six sigma projects and personal experiences part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 96 Six Sigma Projects and Personal Experiences Fig. 2. ANOVA for Different Lots of Wafers Fig. 3. Variance Test for Lots of Wafers Factor Levels Pressure psi 95 100 110 Tooling Height inches 0.060 0.070 0.080 Cycle Time milliseconds 6000 7000 8000 Machine 1 2 3 Table 5. Factors Evaluated in Equipment Grit Blast The analysis for the data from Table 6 was run with a main effect full model. This model is saturated therefore the two main effects with the smallest Sum of Squares were left out from the model. This is that Machine and Cycle time do not affect the electrical Performance. The analysis for the reduced model is presented in Figure 4. It can be observed that the Pressure and the Tooling Height are significant with p-values of 0.001 and 0.020 respectively. Successful Projects from the Application of Six Sigma Methodology 97 Pressure psi Tooling Height in Cycle Time milliseconds Machine Acceptable 95 0.060 6000 1 0.9951 95 0.070 7000 2 0.9838 95 0.080 8000 3 0.9908 100 0.060 7000 3 0.9852 100 0.070 8000 1 0.9713 100 0.080 6000 2 0.986 110 0.060 8000 2 0.9639 110 0.070 6000 3 0.9585 110 0.080 7000 1 0.9658 Table 6. Results of Runs in Grit Blast General Linear Model Acceptable versus Pressure Ips. Tooling Heig Factor Type Levels Values Pressure psi fixed 3 95f 100 110 Tooling Height in fixed 3 0.06 0.07 0.08 Analysis of Variance for Acceptable using Adjusted ss for Tests Source DF Seq ss Adj ss Adj MS F p Pressure psi 2 0.0011478 0.0011478 0.0005739 70.37 0.001 Tooling Height in 2 0.0001978 0.0001978 0.0000989 12.12 0.020 Error 4 0.0000326 0.0000326 0.0000082 Total 8 0.0013782 s 0.00285589 R-Sq 97.63 R- Sq adj 95 .27 Fig. 4. ANOVA for the Reduced Model for the Grit Blast Parameters Main Effects Plot fitted means for Acceptable Fig. 5. Chart in Benchmarks Main Effects of Grit Blast 98 Six Sigma Projects and Personal Experiences The Figure 5 shows the main effects plot for all four factors which confirm that only Pressure Tooling Height and Cycle Time are affecting