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  Measurement, Test and Calibration
  What is Cgk?

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Author Topic:   What is Cgk?
Atul Khandekar
Forum Contributor

Posts: 21
From:Pune, India
Registered: Mar 2000

posted 19 March 2000 04:52 AM     Click Here to See the Profile for Atul Khandekar   Click Here to Email Atul Khandekar     Edit/Delete Message   Reply w/Quote
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 (Sorry, I don't remember the complete URL of the page right now)

Thanx in advance.

Atul Khandekar

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Brian Dowsett
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Posts: 35
From:Waterford, Ireland
Registered: Nov 1999

posted 20 March 2000 11:01 AM     Click Here to See the Profile for Brian Dowsett   Click Here to Email Brian Dowsett     Edit/Delete Message   Reply w/Quote
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!

I think the old (outdated) Ford R&R manual had details on this.

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Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA

posted 29 March 2000 08:30 AM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
From: (Tomo Doran)
Newsgroups: misc.industry.quality
Subject: Re: What is Cgk?
Date: 29 Mar 2000 03:51:31 GMT

The 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 information

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