Potential capability considers only the variation within subgroups, which is shown by the smaller curves. It indicates how well your process could perform if you eliminated variation between …

Use Cpk to evaluate the potential capability of your process based on both the process location and the process spread. Potential capability indicates the capability that could be achieved if …

You can use a capability analysis to determine whether a process is capable of producing output that meets customer requirements, when the process is in statistical control.

Evaluate the overall capability of the process. To perform the analysis, you must specify a lower or upper specification limit (or both) to define your process requirements. The analysis …

Methods and formulas for potential capability measures in Normal Capability Analysis

Use Cnpk to evaluate the overall capability of your process based on both the process location and the process spread. Overall capability indicates the actual performance of your process …

Use Normal Capability Sixpack to assess the assumptions for normal capability analysis and to evaluate only the major indices of process capability. Using this analysis, you can do the …

Capability indices are ratios of the process spread and specification spread. They are unitless values so that you can use them to compare the capability of different processes. Some …

Use a control chart to verify that your process is stable before you perform a capability analysis. Minitab uses the within-subgroup standard deviation to calculate Cp, Cpk, and other measures …

The quality engineers want to assess the process capability. They collect 25 subgroups of five piston rings and measure the diameters. The specification limits for piston ring diameter are …