[Actual] Process Performance Analysis (Pp, Ppk) Process Capability (Cp) and Performance (Cpk) Chart Capability (Cp) and performance (Cpk) charts illustrate a process’s ability to meet specifications. Process capability index formula with process capability example. Process Capability analysis Process: - T ake representative sample of process output - Statistical analysis of samples (Ma thematical tools, Scattered Plot, Pareto Chart, Process Capability Index – Cpk: This is the capability index which accounts for centering of process and is defined as the minimum of Cpk upper and Cpk lower. Process Capability Index Example A manufacturing process produces a certain part with a mean diameter of 2 inches and a standard deviation of 0.03 inches. So we sample 32x and we can calculate the cpk of the dimension from the 32x data. 1. I’ve used similar examples when teaching process capability. The capability indices Cpk, Ppk, and Cpm are all greater than 1.33, which is a generally accepted minimum value for a capable process. The index Cp provides a measure of potential process capability i.e. This was well written in entertaining story style. Cp indicates the spread of variation present in a process. Process capability index (Cpk) is a statistical tool, to measure the ability of a process to produce output within customer’s specification limits. Take the example of a motorcycle driving in the same lane going in … In simple words, it measures producer’s capability to produce a product within customer’s tolerance range. The Cp and Cpk indices are used to evaluate existing, established processes in statistical control. Cpk is the smallest of the Cpu and Cpl. When a business process meets customer requirements, whether it's manufacturing or service-based, it’s known as process capability. Let’s take an example. We want to know the capability of the process . Cpk is used to estimate how close you are to a given targe The lower and upper engineering specification limits are 1.90 inches and 2.05 inches. The process of maintaining this temperature has a standard deviation of 2 degrees Celsius. Although SPC control charts can reveal whether a process is stable, they do not indicate whether the process is capable of producing acceptable output—and whether it is performing to capability. 0.83 6(0.03) 2.05 1.90 6 = − = − = σ USL LSL Cp Process is not a capable process since Cp<1.0 However, I have a real problem with two statements. First, don’t get these guys judging Cp without looking at Cpk also. Process capability – Cp: This is defined as the tolerance width divided by the total spread of process. Process Capability (Cp) is a statistical measurement of a process's ability to produce parts within specified limits on a consistent basis. Cp: Process Capability Index Cpk: Process capability considering location within the upper and lower specification limits or tolerance Cpk is the smaller of the Cpk u or Cpk L C pkU = (USL - X) 3σ C p = (USL - LSL) 6σ C pkL = (X - LSL) 3σ how well a process can perform if there is no change in the underlying process conditions. If process spreads as Car B the garage capability will be low, however, if a process is narrowed like C or D we could see that the process is capable to perform as per customer's expectations. For example , if a dimension is a key characteristic of a product , we have USL and LSL from the drawing. Cpk uses "s-short-term" to predict the behavior of the process. Measuring the process capability index allows you to see if you have the right combination of materials, equipment, people and methods, by comparing the output of a stable process with the process specifications. 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