1. 1 Process and Measurement System Capability Analysis Chapter 7

2. 2 Process Capability Natural tolerance limits are defined as follows:

3. 3 Process may have good potential capability Reasons for Poor Process Capability

4. 4 Data collection steps:

5. 5 Example 7-1, Glass Container Data

6. 6

7. 7

8. 8

9. 9 Practical interpretation – relationship of PCR to the proportion of the tolerance interval used by the process: For the hard bake process:

10. 10 One-Sided PCR

11. 11 Interpretation of the PCR

12. 12 Violation of these assumptions can lead to big trouble in using the data in Table 7-2. Assumptions for Interpretation of Numbers in Table 7-2

13. 13

14. 14 C p does not take process centering into account It is a measure of potential capability, not actual capability

15. 15 A Measure of Actual Capability

16. 16 Specifications not needed to estimate parameters and establish stability

17. 17 Since LSL = 200

18. 18 Linear Combinations

19. 19

20. 20