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 Author Topic:   What is Cgk? Atul KhandekarForum Contributor Posts: 21From:Pune, IndiaRegistered: Mar 2000 posted 19 March 2000 04:52 AM                Can anyone point to any references about what exactly is Cgk (Index of Testing Means Capability) and how is it calculated?I found only one reference to it on the web at http://www.csigmbh.de (Sorry, I don't remember the complete URL of the page right now)Thanx in advance.Atul KhandekarIP: Logged Brian DowsettForum Contributor Posts: 35From:Waterford, IrelandRegistered: Nov 1999 posted 20 March 2000 11:01 AM                Atul,In a previous employment we used to calculate Cg which was done by comparing six standard deviations (from the measurement system) to one tenth of the process specification limits.(tolerance/10)/(6*SD of measurement system).I guess if you used a traceable master to do your study, you could then apply +/- one fifth of the spec to produce an upper and lower limit. Then calculate Cgk upper & lower using 3 SD's as in Cpk calcs.-for instance Cgk upper = "Upper Limit"-trial mean/ (3* trial SD)Seems like a lot of effort to produce a capability index that no-one recognises though!CheersBrianI think the old (outdated) Ford R&R manual had details on this.IP: Logged Marc SmithCheech Wizard Posts: 4119From:West Chester, OH, USARegistered: posted 29 March 2000 08:30 AM                From: tomodoran@aol.com (Tomo Doran)Newsgroups: misc.industry.qualitySubject: Re: What is Cgk?Date: 29 Mar 2000 03:51:31 GMTThe capability indices Cg & Cgk are related to gaging and compare the variation and location to a reference figure - often 10% of process tolerance in the same way that Cp & Cpk is derived.Let me know if this helps or you want more informationIP: Logged
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