The Elsmar Cove Business Standards Discussion Forums More Free Files Forum Discussion Thread Post Attachments Listing Elsmar Cove Discussion Forums Main Page
Welcome to what was The Original Cayman Cove Forums!
This thread is carried over and continued in the Current Elsmar Cove Forums

Search the Elsmar Cove!

Wooden Line
This is a "Frozen" Legacy Forum.
Most links on this page do NOT work.
Discussions since 2001 are HERE
Owl Line
The New Elsmar Cove Forums   The New Elsmar Cove Forums
  Measurement, Test and Calibration
  What is Cgk?

Post New Topic  Post A Reply
profile | register | preferences | faq | search

UBBFriend: Email This Page to Someone! next newest topic | next oldest topic
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 http://www.csigmbh.de (Sorry, I don't remember the complete URL of the page right now)

Thanx in advance.

Atul Khandekar

IP: Logged

Brian Dowsett
Forum Contributor

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
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!
Cheers

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I think the old (outdated) Ford R&R manual had details on this.

IP: Logged

Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
Registered:

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: [email protected] (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

IP: Logged

All times are Eastern Standard Time (USA)

next newest topic | next oldest topic

Administrative Options: Close Topic | Archive/Move | Delete Topic
Post New Topic  Post A Reply Hop to:

Contact Us | The Elsmar Cove Home Page

Your Input Into These Forums Is Appreciated! Thanks!


Main Site Search
Y'All Come Back Now, Ya Hear?
Powered by FreeBSD!Made With A Mac!Powered by Apache!