What does a PPK of 1.67 mean?
Pp and Ppk > 1.67 The process probably meets customer requirements.
After approval, begin production and follow the Approved Control plan.
1.33 ≤ Ppk ≤ 1.67 The process may not meet customer requirements..
What does a Cpk of 1.33 mean?
Cpk = or >1.33 indicates that the process is capable and meets specification limits. Any value less than this may mean variation is too wide compared to the specification or the process average is away from the target.
How many Sigma is 1.67 Cpk?
6 sigmaCp = Cpk = 1.67. The sigma level is now 5 – the specifications are five standard deviations away from the average. The out of specification has decreased to 0.57 ppm. The fourth curve represents that magical 6 sigma level.
What is an acceptable CPK?
The higher the Cpk, the better is the capability of the process to meet its requirements. In the industry, a Cpk of less than 1.66 needs a closer look. A Cpk that’s less than 1.33 needs some action to make it higher, and a Cpk of less than 1.0 means that the process is not capable of meeting its requirements.