Process Capability - Bradley University

Process Capability - Bradley University

Process Capability Ross L. Fink Process capability is the ability of the process to meet the desired quality (as measured by the specifications) Natual Tolerance Limits LNTL -6 -5 -4 -3

UNTL -2 -1 0 1 Standard Deviations 2 3 4 5

6 Cp-- Process Capability Ratio USL LSL CP 6 Various Cp Values In Relationship to Specifications LSL USL Cp = 2.00 Cp = 1.33 Cp = 1.00 Cp = 0.75 One Sigma Shift

LSL USL Cp = 1.33 -6 -5 -4 -3 -2 -1 0 1

Standard Deviations 2 3 4 5 6 Cpk Process Capability Ratio CPK USL X X LSL Min ,

3 3 Cut-Offs Typical: Cp and Cpk > 1.33 Might be raised: Cost of failure Non-Normality of quality characteristic Process consistently goes out of control

Motorolas Six Sigma Quality Motorolas Six Sigma Quality Cp = 2.00, and Cpk =1.50 PPM = 3.4 Normal v. Six Sigma Quality

Normal Cp = 1.33, Cpk = 1.33 No. of Prob. Within Spec. PPM Characteristics 1 0.999936628 63.37 2 0.999873260 126.74 3 0.999809896 190.10

4 0.999746536 253.46 5 0.999683180 316.82 10 0.999366460 633.54 20 0.998733321 1266.68 50 0.996836311 3163.69 100 0.993682631 6317.37 500 0.968809735

31190.27 1000 0.938592302 61407.70 Six Sigma Cp = 2.00, Cpk = 1.50 Prob. Within Spec. PPM 0.999996599 0.999993198 0.999989798 0.999986397 0.999982996 0.999965992 0.999931986 0.999829974 0.999659977 0.998301040 0.996604967

3.40 6.80 10.20 13.60 17.00 34.01 68.01 170.03 340.02 1698.96 3395.03 Six Sigma Quality Programs Six Sigma Quality--Technical quality-3.4 PPM

Breakthrough Strategy Training--Master Black Belts, Black Belts, and Green Belts Breakthrough Strategy Recognize Define Measure Analyze Improve Control

Standardize Integrate Cost of Quality Appraisal Prevention Internal Failure External Failure

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