1 / 14

IE405 QUALITY MANAGEMENT Recitation 7

IE405 QUALITY MANAGEMENT Recitation 7. -Process Capability Cp and Cpk values -Gage and Measurement System Capability Studies NOVEMBER 26TH 2002. Process Capability Ratios. ACTUAL CAPABILITY. POTENTIAL CAPABILITY. Rec7 Q1. PROCESS IS NOT CAPABLE POSSIBLE ALTERNATIVES

luke-hubbard
Download Presentation

IE405 QUALITY MANAGEMENT Recitation 7

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. IE405 QUALITY MANAGEMENTRecitation 7 -Process Capability Cp and Cpk values -Gage and Measurement System Capability Studies NOVEMBER 26TH 2002

  2. Process Capability Ratios ACTUAL CAPABILITY POTENTIAL CAPABILITY

  3. Rec7 Q1 PROCESS IS NOT CAPABLE POSSIBLE ALTERNATIVES -Change specification limits -Reduce variability

  4. Rec7 Q1 Cpk for 700: • Cpu:0,818 ; Cpl:0,818 Process is producing product that does not conform to specifications. Cpk for 740 -Cpu: 0,4094 ; Cpl:1,22 Choose Cpu Producing products that do not conform to specifications

  5. Rec7 Q1 Cpk for 780: • Cpu:0 ; Cpl:1,637 Choose Cpu Average is equal to one of the specification limits Cpk for 740 -Cpu:- 0.409 ; Cpl:2,0473 Choose Cpu Average is outside specifications.

  6. Rec7 Q2

  7. Rec 7 Q2

  8. Rec7 Q2 • Cp=2.05-1,99/6*0,0971 =0,1029 • Process is not capable • Cpk (Cpu:0,0186 ; Cpl:-0,187) choose Cpl • Average is outside specification limits • P(x<1.99) +P(x>2.05) =0.017 1.7% defective

  9. GAGE AND MEASUREMENT SYSTEM CAPABILITY STUDIES

  10. Characteristics of the X and R charts in gage and measurement system capability studies • X chart shows the DISCRIMINATING POWER of the instrument, ability of the gage to distinguish between units of product. • R chart shows the MAGNITUDE of measurement error, or gage capability. • R values represent the difference between measurements made on the same unit using the same instrument.

  11. Components of Measurement Error • Reproducibility : due to different operators using the gage (different time periods,different environments, or in general different conditions) • Repeatibility:as reflecting the basic inherent precision of the gage itself

  12. Rec7 Q3 REPRODUCIBILITY REPEATABILITY

  13. Rec7 Q3 P/T OF 0.1 or LESS often implies adequate gage capability

More Related