PORDUCTION
The product in question is new but similar to other products for this customer and other products we make for others. Data will be taken from the first production run. Historically, using the equipment, process, and geometry of the product, we should hit this dead-on after setup.
SAMPLING
Our sampling is done in time sequence. Collection is in a plastic tray marked and separated from the remaider of the production (usually 300-500 pieces). Usual operator activity; machine offsets, inspections, breaks are carried on as usual.
MEASUREMENTS
Measurements are done in another area post production. Experienced QC do the measurements and recording. All are currently in calibration. I will do the entry to Excel or MiniTab. Normally when we do such a study, the product is a more complicated item than the one in question. As a matter of fact, I've never done a study on this class of product! Thus no history.
As stated before, our customer wants justification for our sample size. "Rule of thumb" will not keep them happy. We are given thier requirements of confidence and a "power" for our calculations. But were not given sample size or a formula for sample size. A request for direction or requirement got us the -no rule of thumb, and justification memons!
Thanks for all the assistance thus far. I've spent hours reviewing older training materials with no progress. You guys have gotten me farther in one afternoon...