Capability Of Gage (Cg & Cgk) For New And Repaired Gages

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• Thread starter Thread starter Ehsan Heidari
• Start date Start date Dec 24, 2009

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Ehsan Heidari

in AIAG MSA 3th edition, I can`t find any thing about Cg & Cgk, while I red i some books, these indexes must be calculated when we purchase new instrument or repair instruments. however, have anybody more information about Cg & Cgk? Elsmar Forum Sponsor

Stijloor

Leader Super Moderator Re: Capability of Gage (Cg & Cgk)

Ehsan Heidari said: in AIAG MSA 3th edition, I can`t find any thing about Cg & Cgk, while I red i some books, these indexes must be calculated when we purchase new instrument or repair instruments. however, have anybody more information about Cg & Cgk? Click to expand...

Look at this thread What is Cgk? (Index of Testing Means Capability). Stijloor V

Vasant

Re: Capability of Gage (Cg & Cgk) Hi, Gage Cg, Cgk is the standard pubilished by Bosch group and available in german Q-Das SPC software. regards, vasant

Marc

Fully vaccinated are you?

Leader Re: Capability of Gage (Cg & Cgk)

Vasant said: <snip> Gage Cg, Cgk is the standard pubilished by Bosch group <snip> Click to expand...

Anyone know where to get Bosch 'standards'? My assumption is you would have to be a supplier to Bosch to get a copy of their 'standard'.

Stijloor

Leader Super Moderator Re: Capability of Gage (Cg & Cgk)

Marc said: Anyone know where to get Bosch 'standards'? My assumption is you would have to be a supplier to Bosch to get a copy of their 'standard'. Click to expand...

The Manual and its Sections is (broken link removed). I also (broken link removed). Stijloor. . . . Last edited: Jun 18, 2010

Marc

Fully vaccinated are you?

Leader Re: Capability of Gage (Cg & Cgk) Nice of Bosch to make them available to the public. Y

Yulia

Regarding Cgk I have some info. But I am not really sure if its right. 5.4.3 The Gauge Capability (cgk): The gauge capability study is applicable when measurements taken are not influenced by the operator. This is where measurements are taken / read by the measuring unit which is integrated in the machine. Also this method could be applicable when the measurement can not be repeated twice on one sample (destructive measurements). A principle of this study is to measure the same feature at least 50 times using the measuring unit. The acceptable capability index of this study is cgk ≥ 1.33 unless otherwise specified by the customer or by any other means. For calculating the capability values, the following can be used. • Calculation sheet of GME Document ххххххх, Machine Capability Analysis • Mintab Software or any other appropriate software. 5.4.3.1 Evaluation criteria for Gauge Capability: • cgk≥1.33 - the measurement method is acceptable • cgk<1.33 - the measurement system is not sufficient for measurement. The real process capability can be jeopardized by wrong measurement system. A deep analysis must be done in order to define and eliminate the root cause of the variability. (Wrong measuring tool, accuracy, maintenance). • After the root causes are defined and solved, the MSA study must be repeated again. Y

Yulia

May somebody help me with question - is it really possible to use Cgk calculation for made MSA for destructive test? If no, do you know any another calculations? S

sgbhat

MSA as per M/s Bosch CSR manual ; Cg-Cgk etc are mentioned ; Is excel calculation sheets available with anybody ; if Yes can I get them for each said in Bosch CSR Manual

Stijloor

Leader Super Moderator

sgbhat said: MSA as per M/s Bosch CSR manual ; Cg-Cgk etc are mentioned ; Is excel calculation sheets available with anybody ; if Yes can I get them for each said in Bosch CSR Manual Click to expand...

Look at this post (MSA vs. Measurement Capability Analysis - What are the differences?) from our Friend Atul Khandekar. If you are a Bosch Supplier, you should contact Bosch directly and see if they have calculation sheets available. Stijloor.

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