![]() In formula form, the Cpk is: Cpk 1 = (μ – LSL)/3σ and Cpk 2 = (USL – μ)/3σ. Note that the Cpk is the relative distance. ![]() In practice, these are your tolerance limits. In it, LSL is the Lower Specification Limit and USL is the Upper Specification Limit. ![]() As mentioned, the Cpk says something about the distance of the Normal distribution from the (tolerance) specification. The Calculation of the Cpkīefore we start using the Cpk in the tolerance analysis, first a brief explanation of how the Cpk is calculated. Lower failure rate and also more efficient. The Cpk can be used for all kinds of parameters in your production process and ultimately leads, among many other things, to a (more) controlled process. The process capability index Cpk, popularly called ‘the Cpk’, is a measure of the distance of that Normal distribution from the (tolerance) specification. Parts (products) manufactured with a Cpk requirement (almost) always have dimensional deviations with a Normal (Gauss) distribution. An important part in it is the determination of the so-called process capability index Cpk. And put it in a Template!īetter Products and Analysis with Process Capability Index CpkĪ great system for controlling dimensional deviations of parts is Six Sigma. Stack-up Drift in Your Tolerance Table.Using Cpk in Your Tolerance Stack-Up Analysis.Using Cpk, Do You Have all the Information Now?.Better Products and Analysis with Process Capability Index Cpk.
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