The process capability index is a subset of statistical process control (SPC), which is quality control through the use of statistics. Process capability can be further broken down into two values: Cp and Cpk. The purpose of Process Capability (Cp) is to measure how much an output – such as cable length or crimp height – varies, and whether those outputs stay within an acceptable tolerance range as defined by an upper and lower limit. The Process Capability Index (Cpk) measures how closely the range of those values is centered between the two limits. Consistent quality and repeatability are integral to cable manufacturing, and each influences all that we do at iRex. These factors inform the machines we buy, the teams we assemble, and the processes we put in place to measure our outputs. One measure is a Process Capability Index, which we detail below.
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