I am trying to find a needle in a haystack. I need someone with such specific experience that I feel the forum is better for referrals.
I need someone with the following:
Black Belt Certification
Bilingual
Medical Device experience
Associate development experience so that they can track to the GM spot.
If you know of anyone, please contact me at
Skelley@empire-internl.com.
Thanks everyone for your help!
Sandy Kelley
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Comments
firebrew 1/7/2002
The answer is Yes.
Now that we got that out of the way, I'll try to explain.
Control Charting has nothing to do with specifications. In fact, if you have specification limits on an X-Bar/R chart, you aren't doing SPC. I'm not sure what you're doing but it isn't SPC.
The purpose of control charting is to determine when it may be economically justified to look for something that has created a meaningful change in the process. Generally these changes are called "Special Causes".
When there are no "Special Causes" suggested by the chart, one can:
* Make certain assumptions about the totality of product that the charted data represents. In other words, feel confident that the data shown on the chart can be extrapolated to the product that didn't get sampled.
* Feel confident that the process being examined can continue on into the future as the chart indicates until some "Special Cause" creates a change.
WHenever "Special Causes" are indicated, one has no meaningful confidence that the data represented by the chart is representative of the items that didn't get sampled, nor that they should be used to make any predictions about the future performance of the process.
In short, Control Charts for variable data have nothing to do with specifications. A process can indeed produce product that is consistent, and statistically stable, and yet have some percentage (or all product) out of specification.
J Bruman
simpsonm 1/7/2002
I may not have phrased my question right for what I am wondering. If you are using your control chart to monitor your process for special causes and you are dealing with subgroup sizes of n and in you subgroup one of those samples is out of spec. your plotted point can still be in control. I understand about process capability studies, but if you are an operator running your process and you get an out of spec condition but your subgroup value is in control how do you decide to make the change based on your control chart.