Tag: process capability

Six 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. Defining Standard Deviation In a set of data, mean (μ) and standard deviation (σ) are defined as: μ = […]

Z bench is not where Zorro rested after saving another town. There are a number of Six Sigma terms associated with the letter Z, such as Z score, Z bench long term, Z bench short term, and Z shift. Let’s explore the A to Zs about Z.

As the name implies, capability analysis is an analysis of the ability of your process to meet your customer’s expectations and requirements. There are a number of calculated metrics which can be used to help you do your capability analysis. 

Cpk is one of the metrics calculated for determining whether a process is capable of meeting customer specifications or requirements. 

How do you calculate capability indices? Capability 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. How to Calculate Capability Indices The formula for calculating a Cpk index is easily found: USL, upper specification limit; LSL, lower […]

In Part 2 we look at failure rates and material conditions for a surface finish example.

In Part 1, we explore the concept of process capability, including how to calculate it and what to do with non-normal data.