CP2 - Control vs Capability Any process that is stable over...

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Quality Improvement by Experimental Design Copyright © 2005 by Bruce Ankenman. All rights reserved. 2.1 Copyright © 2014 Bruce Ankenman. All rights reserved Control – vs – Capability Any process that is stable over time is IN CONTROL. Only a process that is making product to specification is CAPABLE.
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Quality Improvement by Experimental Design Copyright © 2005 by Bruce Ankenman. All rights reserved. 2.2 Copyright © 2014 Bruce Ankenman. All rights reserved IN CONTROL AND CAPABLE TIME Mean Lower Specification Upper Specification
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Quality Improvement by Experimental Design Copyright © 2005 by Bruce Ankenman. All rights reserved. 2.3 Copyright © 2014 Bruce Ankenman. All rights reserved IN CONTROL, BUT NOT CAPABLE TIME Mean Lower Specification Upper Specification
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Quality Improvement by Experimental Design Copyright © 2005 by Bruce Ankenman. All rights reserved. 2.4 Copyright © 2014 Bruce Ankenman. All rights reserved IF A PROCESS IS NOT IN CONTROL IT CANNOT BE TRULY CAPABLE TIME Mean Lower Specification Upper Specification
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Quality Improvement by Experimental Design Copyright © 2005 by Bruce Ankenman. All rights reserved. 2.5 Copyright © 2014 Bruce Ankenman. All rights reserved Capability Index – A measure of how well the process distribution fits into the specifications NOT n If C p is greater than 1 then the process can fit in the specs. p C USL-LSL 6 N( , 2 ) Process Distribution 6 Specification Range Upper Spec. USL Lower Spec. LSL R d 6 ) LSL USL ( 2 2 d R
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Quality Improvement by Experimental Design Copyright © 2005 by Bruce Ankenman. All rights reserved. 2.6 Copyright © 2014 Bruce Ankenman. All rights reserved Even if C p is greater than 1, there can be many parts out of specification if the process is not on target: Process Distribution 6 USL LSL Parts Out of Specification Process Distribution 6 USL LSL 99.7% of parts in Specification If C p equals 1, and the process is Normal and on target:
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Quality Improvement by Experimental Design Copyright © 2005 by Bruce Ankenman. All rights reserved. 2.7 Copyright © 2014 Bruce Ankenman. All rights reserved If C pk is greater than 1 then process is capable. Process Distribution USL LSL Distance from mean to closest Spec Limit. R d 3 SL Closest X 2 X pk C X Closest Spec. Limit | 3
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Quality Improvement by Experimental Design Copyright © 2005 by Bruce Ankenman. All rights reserved. 2.8 Copyright © 2014 Bruce Ankenman. All rights reserved Example: Specification {3, 8} 3 . 4 X R A 2 X R A 2 X X Chart R D 4 R D 3 35 . 1 R 0 R Chart (n=4)
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Quality Improvement by Experimental Design Copyright © 2005 by Bruce Ankenman. All rights reserved. 2.9 Copyright © 2014 Bruce Ankenman. All rights reserved 27 . 1 6 3 8 6 LSL USL 059 . 2 35 . 1 p C 66 . 0
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