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• Capability indices such as Cp and Cpk compare the process variation to the customers specifications. They are used to determine if the variation is wider than the specifications, the process is not centered or both. • If process data is collected over a long time period, Pp and Ppk are used to determine the Cp and Cpk are based on short term variability • Pp and Ppk are based on total variability. 18. Cpk • Cpk is an process capability index that assesses how close the process mean is from the specification limit. • Process Capability is an important topic in continuous improvement and quality engineering and in this video, we discuss the basics of process capability Cp, Cpk, Pp, Ppk (in other words Process Capability) takes a major role in ensuring quality by measuring automobile components. Cpk=min(USL-XBAR/3Sigma,LSL-XBAR/3Sigma). Pp and Ppk -> Process Performance. Pp: measures how well the data fits within the spec limits (USL and LSL). Pp and Ppk are rarely used compared to Cp and Cpk. They should only be used as relative comparisons to their counterparts. Capability indices, Cp and Cpk, should be compared to one another to assess the differences over a period of time. several capability indices Cp, Cpk, Ppk, Cpm, NCpk. In this article we will discuss the most. 4 General remarks. This whitepaper was written to give you some better information on the use of the capability. indices Cp, Cpk, Pp and Ppk and the power to use them together to get insight what is Eger Cpk, Cp degerine esit ise, makine tolerans aral?g?n?n tam ortas?nda uretilecek sekilde ayarlanm?st?r. (bkz. Proses yeterlilik Cp ve Cpk n?n olculdugu uzun vadeli bir cal?smad?r prosesin cal?sma suresince tolerans limitleriyle iliskili olarak ne kadar iyi performans gosterdiginin yan? s?ra X. Process performance index, is a statistical tool to verify if the sample that have generated from the process is capable to meet the customer requirement. It measures the performance of the process related to both dispersion and centeredness. Cpk = If Cp > Cpk or Cpk > Ppk. Your process is unstable or data was sorted. Cr = If Cr is greater than or equal to 1, value turns red. How Cpk and Ppk Are Calculated, part 2 - Minitab. In my previous post, we saw how Ppk is calculated. This time, we'll go through the calculation of Cpk, using the same Cpk =1.59. Pp = 1.62. Ppk = 1.60. All four values are approximately the same, which is apparently one hallmark of an excellent process. In reality, this data came from a normal distribution random number generator, with a mean of 0 and standard deviation of 1. Theoretically, all four indices should be 1.67. Learn the difference between Cp Cpk (process capability) and Pp Ppk (process performance) metrics. Calculate them all in seconds using QI Macros. Cp and Cpk use Sigma estimator. Pp and Ppk Process Performance Metrics. Pp is the performance index. It measures how well the data might fit

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