![]() Cp represents the statistical spread of a process value of interest.Ĭp, short for capability process, is the statistical spread of a process value within its tolerance limits. ![]() This article covers the use of these statistical tools for tolerance analysis and overviews:įigure 1. These tools are frequently a part of Design for Six Sigma (DFSS) programs in use by many manufacturers. ![]() For example, production quality can vary due to factors such as machine tool wear, different operators, changes in materials, or fluctuations in ambient temperatures.įor mechanical designers, Cp, Cpk and PPM values help analyze the impacts of their geometric, dimensional, and tolerancing (GD&T) decisions on the robustness of their design for meeting functional requirements, such as for positions, motions, or force levels. The calculations are associated with statistical process control or SPC, which is widely applied for monitoring of production and as part of product design.įor production, SPC monitors for trends in real time that can lead to costly quality issues. Cp, Cpk, and PPM are statistical calculation parameters used to improve the quality and lower the costs of manufactured products.Ĭp, Cpk, and PPM are statistical calculation parameters commonly used to improve the quality and lower the costs of manufactured products.
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