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We are in a bit of a dilema. Engineering and Quality are arguing about the use of "bonus" tolerance when calculating Ppk/Cpk values. One subcommittee member of ASME Y14.5M-1994 said that this is used only for building functional gages or in individual layouts, not for capability studies. I'm seeking a second opinion. I have been unable to find any basis for this in the standard. The closest I have come is on page 85 on the note after section 5.3.2.2, but this is vague.
Thanks,
Dura Guy
Manufacturing Engineer
Thanks,
Dura Guy
Manufacturing Engineer