S SteveT May 3, 2001 #1 May 3, 2001 #1 Could someone please describe to me what statistical index Cmk is, what it means, and how to calculate it. Many Thanks SteveT

Could someone please describe to me what statistical index Cmk is, what it means, and how to calculate it. Many Thanks SteveT

F freeda May 3, 2001 #2 May 3, 2001 #2 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.

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.

D Don Winton May 3, 2001 #3 May 3, 2001 #3 See Also: Cmk calculation Spc from each cavity? Ppk vs. Cpk Ppk Cm vs. Cmk ? The difference between the R&R study and the Cmk CPK vs.CMK Regards, Don

See Also: Cmk calculation Spc from each cavity? Ppk vs. Cpk Ppk Cm vs. Cmk ? The difference between the R&R study and the Cmk CPK vs.CMK Regards, Don

D Don Winton May 4, 2001 #5 May 4, 2001 #5 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, Don ------------------ I was better but I got over it.

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

D Don Winton May 4, 2001 #6 May 4, 2001 #6 ...what it means... Ooops. Forgot. Cpmk is used when the tolerances are not symmetric about the target. Regards, Don ------------------ I was better but I got over it.

...what it means... Ooops. Forgot. Cpmk is used when the tolerances are not symmetric about the target. Regards, Don ------------------ I was better but I got over it.

N narfeldt Jun 7, 2001 #7 Jun 7, 2001 #7 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).]

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).]

Marc Hunkered Down for the Duration Staff member Admin Apr 3, 2010 #8 Apr 3, 2010 #8 Blast from the Past!

bobdoering Stop X-bar/R Madness!! Trusted Information Resource Apr 3, 2010 #9 Apr 3, 2010 #9 Bothe's book Measuring Process Capability: Techniques and Calculations for Quality and Manufacturing Engineers has a myriad of capability indices for all occasions. Poor guy, all that work to seek the holy grail of one number to descibe a process. By the way...CM Punk is a WWE wrestler...just in case you get on the wrong Wiki page looking this up.

Bothe's book Measuring Process Capability: Techniques and Calculations for Quality and Manufacturing Engineers has a myriad of capability indices for all occasions. Poor guy, all that work to seek the holy grail of one number to descibe a process. By the way...CM Punk is a WWE wrestler...just in case you get on the wrong Wiki page looking this up.