Although the two PreRun methods originated in the North American market, they are increasingly being used worldwide before the actual machine capability analyses.
What do you want to do with the analyses?
A new production machine is set up or a new process is started. Now you could produce and measure 50 parts right away, and then you might find that you could have saved the production of 45 parts because you still have to set up the machine. This is where PreRuns come in.
The first part is directly measured and evaluated with the "1-Part PreRun".
The first "subset" of 5 parts is then produced, measured and evaluated with the "5-Part PreRun".
Various graphs and reports are available for this and the "Results" tab.
The respective evaluations have their own "smiley" and, as always, the requirements are anchored in the evaluation strategy.
Describe the requirements in prose:
The first measured value is checked to see if it is within a certain tolerance range. If all values are within the range, the first subgroup is checked, in which the average and the ranges are also checked.
The percentages are taken from the strategies that these groups have had good experience with. There is not much statistics behind them. The percentages are empirical values that have worked well in the past.