1.11 Preliminary Identification of Special Product and Process Characteristics

#1
Hello,

I am needing some help with understanding the term "Special" process characteristics and identification of. We assemble PCB's and are a contract manufacturer, our customer has already determined "special" product characteristics, and we need to identify "special" process characteristics. Could someone help with getting me on the right track with this term, if you have specific examples of PCB assembly, that would be even better. I understand down the road these would likely make it to the control plan. I appreciate any help or advice here!
 
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John Predmore

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#3
Some industries use the word "special" to refer to a dimension or characteristic that is safety or hazard-related. Some others use "special" to refer to characteristics where variation makes it difficult to produce conforming product. Another definition of special characteristic is where the quality cannot be immediately determined through practical means (in the case where destructive testing is needed, or where the final assembly must be tested to assess the quality of the component), and then some sort of validation is needed. My thoughts are, your customer will tell you what definition of special applies to your product, and you tell the people at the Cove, so we can give you help or advice. I personally do not have experience in PCB manufacture. What industry is involved and what standard defines what your customer means by "special"?
 

Miner

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#4
Are you familiar with a parameter diagram (see below)?

The customer specified special product characteristic is the Response or Y. Your special process characteristic would be a control factor (X) or Input (X). Depending on your particular process, special process characteristics might be solder paste dimensions, oven temperature, line speed, etc. that are important for controlling the response.

Process P_diagram.png
 
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