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  Statistical Techniques and 6 Sigma
  Cmk

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Author Topic:   Cmk
SteveT
unregistered
posted 03 May 2001 11:18 AM           Edit/Delete Message   Reply w/Quote
Could someone please describe to me what statistical index Cmk is, what it means, and how to calculate it.

Many Thanks SteveT

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dWizard
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Posts: 20
From:Normandy, TN 37360
Registered: Mar 2001

posted 03 May 2001 12:47 PM     Click Here to See the Profile for dWizard   Click Here to Email dWizard     Edit/Delete Message   Reply w/Quote
I do not know about Cmk, but Cpmk is defined as:

Cpmk = (USL LSL)/(6*(sqrt(StandardDeviation^2+(mean T)^2)))

Where T = Target Value.

This link http://www.asq.org/pub/jqt/past/vol32_issue4/qtec-440.pdf gives some additional info. This is a PDF file, so you will need Acrobat Reader to access it.

Hope this helps.

Regards,
dWizard

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I was better but I got over it.

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dWizard
Forum Contributor

Posts: 20
From:Normandy, TN 37360
Registered: Mar 2001

posted 03 May 2001 12:54 PM     Click Here to See the Profile for dWizard   Click Here to Email dWizard     Edit/Delete Message   Reply w/Quote
...what it means...

Ooops. Forgot. Cpmk is used when the tolerances are not symmetric about the target.

Regards,
dWizard

------------------
I was better but I got over it.

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freeda
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Posts: 26
From:Jeffersonville, IN
Registered: Dec 2000

posted 03 May 2001 02:29 PM     Click Here to See the Profile for freeda   Click Here to Email freeda     Edit/Delete Message   Reply w/Quote
Cmk is defined as a capability index for a stable machine. It uses the same formula as Ppk.
Cmk is a short term study of a machine capability. Whereas Ppk is a short run study for a process.

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dWizard
Forum Contributor

Posts: 20
From:Normandy, TN 37360
Registered: Mar 2001

posted 03 May 2001 02:56 PM     Click Here to See the Profile for dWizard   Click Here to Email dWizard     Edit/Delete Message   Reply w/Quote
See Also:

https://elsmar.com/ubb/Forum10/HTML/000067.html

https://elsmar.com/ubb/Forum10/HTML/000068.html

https://elsmar.com/ubb/Forum10/HTML/000001.html

https://elsmar.com/ubb/Forum10/HTML/000028.html

https://elsmar.com/ubb/Forum10/HTML/000095.html

https://elsmar.com/ubb/Forum10/HTML/000156.html

https://elsmar.com/ubb/Forum10/HTML/000160.html

Regards,
dWizard

[This message has been edited by dWizard (edited 03 May 2001).]

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Al Dyer
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Posts: 622
From:Lapeer, MI USA
Registered: Oct 2000

posted 03 May 2001 03:06 PM     Click Here to See the Profile for Al Dyer   Click Here to Email Al Dyer     Edit/Delete Message   Reply w/Quote
Thanks for the link Don, it's a good read.

ASD...

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narfeldt
Forum Contributor

Posts: 12
From:Landskona, Skne, Sweden
Registered: May 2000

posted 07 June 2001 04:03 AM     Click Here to See the Profile for narfeldt   Click Here to Email narfeldt     Edit/Delete Message   Reply w/Quote
Ain't Cmk=revised rates of machine capability and calculates by the formula:

Cmk = 2((UTL-Mean)/(Xmax-Xmin))
Cmk = 2((LTL-Mean)/(Xmax-Xmin))
Cmk = the lowest value of above formula

Is this incorrect?

------------------
/Best wish Narfeldt

[This message has been edited by narfeldt (edited 07 June 2001).]

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