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TS 16949 Process Capability Requirements - Cpk ≥ 1.67 on All Key Parameters?


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process capability, ts 16949 - automotive quality system standard, key characteristics (general), cpk (related to process capability)
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  Post Number #1  
Old 20th April 2011, 02:51 PM
qusys

 
 
Total Posts: 2,227
Please Help! TS 16949 Process Capability Requirements - Cpk ≥ 1.67 on All Key Parameters?

Is Cpk ≥ 1.67 on All Key Parameters a must for an ISO TS 16949 certified company, even though there is no stipulated agreement with the Customer?

If is it between 1.33 and 1.67 in mass production is ok the same ? Is it needed a documented record attesting or PPAP approval by the customern according AIAG guidelines is enough?

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  Post Number #2  
Old 20th April 2011, 06:40 PM
Stijloor's Avatar
Stijloor

 
 
Total Posts: 15,001
Re: TS 16949 Process Capability Requirements - Cpk ≥ 1.67 on All Key Parameters?

Quote:
In Reply to Parent Post by qusys View Post

Is Cpk ≥ 1.67 on All Key Parameters a must for an ISO TS 16949 certified company, even though there is no stipulated agreement with the Customer?

If is it between 1.33 and 1.67 in mass production is ok the same ? Is it needed a documented record attesting or PPAP approval by the customer according AIAG guidelines is enough?
The AIAG PPAP manual provides the default requirements for capability studies.

If you have concerns about the (capability) performance of your process, you must contact the authorized customer representative.

Stijloor.
Thanks to Stijloor for your informative Post and/or Attachment!
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  Post Number #3  
Old 20th April 2011, 06:52 PM
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bobdoering

 
 
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Re: TS 16949 Process Capability Requirements - Cpk ≥ 1.67 on All Key Parameters?

Quote:
In Reply to Parent Post by Stijloor View Post

The AIAG PPAP manual provides the default requirements for capability studies.
Look in the 4th edition PPAP book, page 7, "The level of initial process capability or performance shall be determined to be acceptable prior submission for all Special Characteristics designated by the customer or organization."

Make sure to read 2.2.11.5 and 2.2.11.6.
Thanks to bobdoering for your informative Post and/or Attachment!
  Post Number #4  
Old 20th April 2011, 07:01 PM
Stijloor's Avatar
Stijloor

 
 
Total Posts: 15,001
Re: TS 16949 Process Capability Requirements - Cpk ≥ 1.67 on All Key Parameters?

Quote:
In Reply to Parent Post by bobdoering View Post

Look in the 4th edition PPAP book, page 7, "The level of initial process capability or performance shall be determined to be acceptable prior submission for all Special Characteristics designated by the customer or organization."

Make sure to read 2.2.11.5 and 2.2.11.6.
I know the PPAP Manual...

Stijloor.
Thanks to Stijloor for your informative Post and/or Attachment!
  Post Number #5  
Old 21st April 2011, 04:43 AM
qusys

 
 
Total Posts: 2,227
Re: TS 16949 Process Capability Requirements - Cpk ≥ 1.67 on All Key Parameters?

Quote:
In Reply to Parent Post by Stijloor View Post

The AIAG PPAP manual provides the default requirements for capability studies.

If you have concerns about the (capability) performance of your process, you must contact the authorized customer representative.

Stijloor.
As per 2.2.11.1 of AIAG PPAP manual , the organization shall obtain customer concurrence on the index for estimating initial process capability prior to submission.

The question is: how should this happen? Is it required a written communication of the customer and so a formal response, or is it enough the proposal ( via email or through meeting) of the supplier without a formal "yes, we agree" of the customer representative?
  Post Number #6  
Old 21st April 2011, 06:23 AM
Stijloor's Avatar
Stijloor

 
 
Total Posts: 15,001
Re: TS 16949 Process Capability Requirements - Cpk ≥ 1.67 on All Key Parameters?

Quote:
In Reply to Parent Post by qusys View Post

As per 2.2.11.1 of AIAG PPAP manual , the organization shall obtain customer concurrence on the index for estimating initial process capability prior to submission.

The question is: how should this happen? Is it required a written communication of the customer and so a formal response, or is it enough the proposal ( via email or through meeting) of the supplier without a formal "yes, we agree" of the customer representative?
Simple, but important concept in customer (requirements) communication: "Get it in Writing!!"
Then review, and communicate it to those who will be affected.
Even an email would suffice, and make it part of your PPAP files.

Stijloor.
  Post Number #7  
Old 21st April 2011, 07:20 AM
qusys

 
 
Total Posts: 2,227
Re: TS 16949 Process Capability Requirements - Cpk ≥ 1.67 on All Key Parameters?

Quote:
In Reply to Parent Post by Stijloor View Post

Simple, but important concept in customer (requirements) communication: "Get it in Writing!!"
Then review, and communicate it to those who will be affected.
Even an email would suffice, and make it part of your PPAP files.

Stijloor.
So , if you send a detailed email on this, but there is any response from their customer representative, do you assume that it is a positive response or not?
Is it required a record attesting clearly "yes" ?

Last edited by qusys; 21st April 2011 at 07:21 AM. Reason: typing
  Post Number #8  
Old 21st April 2011, 07:22 AM
Stijloor's Avatar
Stijloor

 
 
Total Posts: 15,001
Re: TS 16949 Process Capability Requirements - Cpk ≥ 1.67 on All Key Parameters?

Quote:
In Reply to Parent Post by qusys View Post

So , if you send a detailed email on this, but there is any response from the customer representative, do you assume that it is a positive response or not?
Is it required a record attesting clearly "yes" ?
No, the customer should respond to your request. Why should they not?

Stijloor.
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