Product or Process Tolerence - AIAG MSA Reference Manual 3rd edition page 3

A

Anatta

#1
All,

pls enlighten.

in AIAG MSA reference manual 3rd edition, it mention on page 3 that:

For Product Control situations where the measurement results and desicion criteria determine, "conformance or non- conformance to the feature specification" must be selected, but need not cover the entire process range. The assessment if the measurement system is based on the feature tolerence.

~~and...

For process control situation where the measurement results and desicion criteria determine, "process stability, direction and compliance with the naturl process variation" .....An independent estimate of process variation is recommended when assesing the adequacy of the measurement system for process control.

Can we say, in the case when we use minitab to perform the analysis. Under option dialog box, in the field of Process tolerence, we use product tolerence when it is a product control situation?
 
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J

jrubio

#2
Focus on process
If you are meassuring a variable which control your process , a process charasterist then it will be the process tolereance. i.e Oil temperature. +-2ºF

Focus on Product.

But if you are meassuring a significant charasterist of the product (The more representative of your product but not meassure the process) it will be the product tolerance. i.e Diameter. +-0.2mm

If you do not have a process continous variable and this is attibutive therefore your charasterist will be on your product.

But you can have several MSA for all significant charasterist on the protuct/proccess and for sure to include the safety charasterists.

:biglaugh: :biglaugh:
 
J

jrubio

#3
All these charasterists must be included previously in the FMA, therefore your FMA will tell you those who apply the MSA.

:notme:
 

Jim Wynne

Staff member
Admin
#4
Anatta said:
All,

pls enlighten.

in AIAG MSA reference manual 3rd edition, it mention on page 3 that:

For Product Control situations where the measurement results and desicion criteria determine, "conformance or non- conformance to the feature specification" must be selected, but need not cover the entire process range. The assessment if the measurement system is based on the feature tolerence.

~~and...

For process control situation where the measurement results and desicion criteria determine, "process stability, direction and compliance with the naturl process variation" .....An independent estimate of process variation is recommended when assesing the adequacy of the measurement system for process control.

Can we say, in the case when we use minitab to perform the analysis. Under option dialog box, in the field of Process tolerence, we use product tolerence when it is a product control situation?
I'm not familiar with Minitab, but we have folks here who are, so stay tuned.
 
J

jrubio

#5
Anatta said:
All,


Can we say, in the case when we use minitab to perform the analysis. Under option dialog box, in the field of Process tolerence, we use product tolerence when it is a product control situation?
Yes.

for the study is the same Process tolerance or Produce tolerance.
it depends the variable you are meassuring.

Process var -> Introduce in that dialog box the proccess tolerance.

Product var -> Introduce in that dialog box the product tolerance.
 
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