tailieunhanh - 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 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 and respectively. Successful Projects from the Application of Six Sigma Methodology 97 Pressure psi Tooling Height in Cycle Time milliseconds Machine Acceptable 95 6000 1 95 7000 2 95 8000 3 100 7000 3 100 8000 1 100 6000 2 110 8000 2 110 6000 3 110 7000 1 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 Analysis of Variance for Acceptable using Adjusted ss for Tests Source DF Seq ss Adj ss Adj MS F p Pressure psi 2 Tooling Height in 2 Error 4 Total 8 s R-Sq 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