Z scores help estimate the non-conforming PPM. Also, the “Cmk” refers to Machine Capability, instead of Process Capability (Cpk). Cmk is measured using 50 or more continuous samples produced on a machine, keeping all influences other than the machine parameters constant.50 measurements (a minimum of 20) are effected under identical conditions (measurements carried out by the same operator on the same part) or standard and feature at a precisely defined point, and then the deviations of the indications from the nominal indication are recorded. Cg examines the equipment-related variation behavior of the measuring system at the location of application.And although the calculations are the same, the difference is in the methodology of measurement and how the data is collected. QI Macros uses uses “Cp” and “Cpk” as the default names.
The Cpm is an uncommonly used Capability Index that can be used when you have a target value.Ĭpm = (USL-LSL)/(6√(sigma2+(Xbar-Target)2)Ĭg and Cmk are calculated the same as Cp and Cpk (respectively). Free Agile Lean Six Sigma Trainer Training.Animated Lean Six Sigma Video Tutorials.
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