Determining Sample Size and Frequency for Features on Control Plans

[George Trybulski]

When developing control plans, is there a "standard" way to come up with a sample size for a peticular feature. I don't agree to base it on quantity of the order but should it be on the critical nature of the dimension ?

[Marc]

I don't know of a 'standard'. It depends upon the type of process, how critical the dimension is, how stable the process is and what you are trying to do in general.

Are you thinking SPC here?

don't forget to consider the output RPN of FMEA.

Originally posted by chen:
don't forget to consider the output RPN of FMEA.

I am a rookie in the the field of quality control field. Could somebody help to the defination of DOE ,QFD , RPN ,ASO and AIAG?

[Marc]

DOE = Design of Experiments

QFD = Quality Function Deployment

RPN = The number obtained in an FMEA when you multiply the 3 factors of that FMEA type. I think the acyronym is something like Resultant Priority Number

ASO = I have no idea

AIAG = Auto Industry Action Group

[SAMOON]

RPN= Risk Priority Number

[Marc]

In Reply to Parent Post by George Trybulski

When developing control plans, is there a "standard" way to come up with a sample size for a particular feature. I don't agree to base it on quantity of the order but should it be on the critical nature of the dimension ?

This is an old thread which "bubbled up". Would anyone care to comment on the starting post since it was never adequately answered?

[ssz102]

according with my experience, the size of sampling depends the type of product your production or how does the product are manufacturing?
generally speaking, sampling 3---5pcs for cosmetic, and approximate 5pcs for measurement studies, and about 1--2pcs as function or performance analysis