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Best Fit Alignment / Capability Question

I have a question concerning capability on a ten hole set. Each hole is part of the -B- so a 2d best fit alignment was made. My results are all in tolerance, but not capable. A general rule I was told that the measured features must be within 20% of nominal to be capable. Now, if the best fit averages out all the hole deviations, can you do a cap study like this? I have always done a cap study locking in the datum's. Let me know what you think about this question.

Odda
Parents
  • Off topic as not for pcdmis, lol. I am using the two axis deviations and splitting the tolerance in half. I am questioning the best fit alignment since it averages the readings. The readings could be different from part to part. My TP tolerance is Ø.25mm, like I mentioned, I am using ± .125mm. For a stamping, the readings are great, but cap wise, not so. I was thinking of aligning to three holes using an iterative just to see if it helps. I am hoping the best fit experts here can give me some guidance.
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  • Off topic as not for pcdmis, lol. I am using the two axis deviations and splitting the tolerance in half. I am questioning the best fit alignment since it averages the readings. The readings could be different from part to part. My TP tolerance is Ø.25mm, like I mentioned, I am using ± .125mm. For a stamping, the readings are great, but cap wise, not so. I was thinking of aligning to three holes using an iterative just to see if it helps. I am hoping the best fit experts here can give me some guidance.
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