Cpk Calculation Excel
Cp stands for process capability and Cpk stands for process capability index. Both are used for the measure of a potential capability of a process in short term. The higher the sigma level, the better the process is performing. You can learn how to calculate Cp and Cpk values using this tutorial. Learn to calculate the Process Capability (Cp) and Process Capability Index (Cpk) values using the steps and few examples given here.
- SPC Format DOWNLOAD Excel Template of SPC Study: SPC Format is commonly used in the industry to know Process capability and how well the process Performs to meet the requirements. SPC study consists of 1 Control Chart 2 Process Capability.
- Cpk & Ppk Calculator Macro1 Macro2 Macro3 Macro4 Macro5 Data 1 Data 2 Data 3 Data 4 Data 5 Min. Range USL LSL Ppk Std. Data 6 Pp Input Range Cell Links Statistics Calculations C4(d) Yield Count Below 'LSL' Count Above 'USL' Sum Protection Email for questions and bugs Cp Cpk.
Learn to Calculate Process Capability Index - Tutorial, Definition and Example
Process Capability (Cp) Definition:
The following formula is used to calculate the CPK, or process capability index, of a given set of data. CPK = Min (USL – mean/3. std.), (mean-LSL/3.std.) Where CPK is the process capability index USL. Cp stands for process capability and Cpk stands for process capability index. Both are used for the measure of a potential capability of a process in short term. The higher the sigma level, the better the.
Process capability is a technique to find out the measurable property of a process to a specification. Generally, the final solution of the process capability is specified either in the form of calculations or histograms
Process Capability Index (Cpk) Definition:
Process capability index (cpk) is the measure of process capability. It shows how closely a process is able to produce the output to its overall specifications.
Formula :
Where,
USL = Upper Specification Limit, LSL = Lower Specification Limit.
Example :
Food served at a restaurant should be between 38°C and 49°C when it is delivered to the customer. The process used to keep the food at the correct temperature has a process standard deviation of 2°C and the mean value for these temperature is 40. What is the process capability of the process?
Given,
USL (Upper Specification Limit) =49°C LSL (Lower Specification Limit) =39°C Standard Deviation =2°C Mean = 40
To Find,
Cpk Calculation Excel Template Free
Process Capability & Process Capability Index
Solution:
| Process Capability : | |
|---|---|
| Process Capability | = (49 - 39) / (6 * 2) |
| = 10 / 12 | |
| = 0.833 | |
| Process Capability Index : | |
| Solution 1 | |
| (USL-mean/ 3*std.Dev) | = (49 - 40) / (3 * 2) |
| = 1.5 | |
| Solution 2 | |
| (mean-LSL/3*std.Dev) | = (40 - 39) / (3 * 2) |
| = 0.166 | |
| Now, find the minimum value. | |
| Process Capability Index | = min (Solution 1, Solution 2) |
| = min (1.5 , 0.166) | |
| = 0.166 | |
Cp and Cpk are used in Six Sigma Quality Methods for analyzing the performance of the process carried out to deliver any product.
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