Hi All,

i'm in automotive industry and in charge of quality department. we are receiving a lot raw materials from our suppliers. we will summarize all the data monthly and convert it to graph to monitor the trend. Currently i will calculate the acceptance rate based on lot basis and convert it to the graph.

i do not use DPPM because we are using sampling method at incoming checking. Is there:D any other chart or method that i can use to monitor the incoming data efficiently. please give me some idea.

Thank you.

Murugan

I believe that if you are sampling you should summarize monthly your sampling data. Just make sure that you clearly communicate in your report that that the results are derived from sampling.

If you come across nonconforming product your sampling will turn to 100% inspection. Then you can report in PPM.

Please let me know if this is what you were looking for.

What sampling plan are you using now?

...sampling method is commonly applicable in automotive industry… and it is because of its applicability…

…well, unless you are having a problem right now in your production area due to incoming materials, then that is the time you can apply different methodology because it giving you a clear message that your present “method” is not working and that you need different approach to identify the real problem…

…but if the “sampling method” is doing fine at this moment, why you need to make things complicated?... usually, you go only to a more complicated one if the simplified one is no longer applicable to your requirements…

...and going back to your inquiry… What is the best chart to monitor incoming data? – the one that is satisfying your requirements…

hI craig,

We are using Zero defect sampling plan with AQL 6.5

Hi , currently i'm doing the summary based on lot basis. As you said if there is any non conformance, then i should convert it to PPM after 100% inspection. thanx for your idea.

Rgds,
Murugan

hI craig,

We are using Zero defect sampling plan with AQL 6.5


Hi,

could you please send me the details of zero defect sampling plan with aql that u r using

thanks

michelle

I don’t' think that there are any best way or the worst way.....as long you are projecting the correct data will do. LAR or PPM or event does not matter.
Sampling size is given by standard and we are following it …..to decide a sampling size we should know the capability if the process and at what confidence level are we looking at. This will decode the sampling size.
Take your inspection size for each lot and the reject to present your date by DPPM. 1000=0.1% does this correlate with your LAR? if yes you are in the right track .

I don’t' think that there are any best way or the worst way.....as long you are projecting the correct data will do. LAR or PPM or event does not matter.
Sampling size is given by standard and we are following it …..to decide a sampling size we should know the capability if the process and at what confidence level are we looking at. This will decode the sampling size.
Take your inspection size for each lot and the reject to present your date by DPPM. 1000=0.1% does this correlate with your LAR? if yes you are in the right track .

hi,

LAR report would be quite ok - can't go wrong there.

You may even compile the IQC data into a Events tracking list as well.
This would come in useful when you need to compile issues in terms of issue repeatability, defining a future use for "High Risk Material" list,etc...

It all depends what you want to use it for.:D