J
johnny xu
Recently my colleagues ask some questions about CPK &PPK when reviewing PPAP package.
It added to my confusion.
Who could tell me correct answer.
1. Which is long-term capability index or short-term as for CPK or PPK.
2. why defined CPK is at least 1.33 and PPK is at least 1.67?
3. is CPK value always less than PPK value when implementing SPC for calculating CPK & PPK on the same spreadsheet?
4. when do we calculate CPK or PPK during preparing PPAP package?
THX
It added to my confusion.
Who could tell me correct answer.
1. Which is long-term capability index or short-term as for CPK or PPK.
2. why defined CPK is at least 1.33 and PPK is at least 1.67?
3. is CPK value always less than PPK value when implementing SPC for calculating CPK & PPK on the same spreadsheet?
4. when do we calculate CPK or PPK during preparing PPAP package?
THX