Reducing Variability with DOE – A Case Study on Propagation of Error (POE)

The Therabath paraffin therapy bath (pictured below) is a durable medical device that holds one gallon of molten paraffin wax. Sufferers of osteoarthritis use it for physical therapy. They dip their hands repeatedly in the heated bath, which helps loosen stiff joints. The wax then slowly solidifies as a glove, producing further therapeutic benefits via […]

Finding the Sigma Level of Customer Complaints

In the beginning of a deployment, many companies set a goal of 3.4 defects per million opportunities (DPMO) using Six Sigma quality concepts in production, and later extend this concept to other operational areas. Fewer companies, however, have extended Six Sigma from a manufacturing application to manage customer satisfaction or customer complaints. But it is […]

Industrial Metals & Mining

A leading manufacturer of aluminium bars for industrial usage found that process chemistry of the end product had high variability. When measurement system analysis was done for the titration method, it was found that the measurement system variation was more than 50% of part to part variation found in the manufacturing process. See full story […]