Process Capability – Surface Finish Example: Part 2
Carl BerardinelliIn Part 2 we look at failure rates and material conditions for a surface finish example.
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Process Capability – The Basics: Part 1
In Part 1, we explore the concept of process capability, including how to calculate it and what to do with non-normal data.
Calculate Capability Indices with Only One Specification
SavageCapability analysis is an essential tool for statistical process control (SPC) and process improvement, applicable to a variety of environments from hospitals and labs to assembly and manufacturing. The formula for calculating a Cpk index is easily found: USL, upper specification limit; LSL, lower specification limit. *Estimated sigma = average…
Understanding Process Sigma Level
Mahmoud RazzaghiSix Sigma is a data-driven approach to quality, aimed at reducing variation and the associated defects, wastes and risks in any process. This article explores the basics of Six Sigma process quality – definition and measurement. In a set of data, mean (μ) and standard deviation (σ) are defined as: μ = x1 + x2…