An approach to deploying control charts with short production runs is to utilize charts of common characteristics across different products. This chart pertains to the characteristic of interest (e.g., diameter) rather than for the diameter of a specific design. A single chart can monitor the characteristic even though the nominal values (and specifications) are different. … Continued

More companies are leveraging high speed vision systems to inspect multiple quality characteristics on their products. This testing directly on the line is a major advancement in inspection and measurement methods.  Automation allows data to be collected quickly and efficiently and 100% inspection becomes feasible.  A common question that arises is, “Does my 100% automatic … Continued

Before applying statistical methods that assume normality, it is necessary to perform a normality test on the data. Figure 1: Histogram depicting a normal (bell-shaped) distribution in WinSPC For example, all of the following statistical tests, statistics, or methods assume that data is normally distributed: • Hypothesis tests such as t tests, Chi-Square tests, F … Continued

WinSPC timed data collection can reduce labor time associated with collecting data. WinSPC has the ability to prompt a device to send a reading, or prompt the operator that a reading is required, at certain intervals or at specific times during Data Collection. This can free up the operator from having to prompt a device at … Continued

This article will review statistical hypothesis testing in general and then introduce equivalence testing and its application. What is equivalence testing and when should we use it? Most quality professionals are familiar with basic hypothesis tests such as the 2-sample t test. However, depending on the goals of the study, another type of test, called … Continued

By systematically detecting (and rectifying) sources of special cause variation upstream in the process, the important process outcomes become predictable. SPC and Reliability We often think of Statistical Process Control as a tool to help drive product quality by informing us when process changes occur. By systematically detecting (and rectifying) sources of special cause variation … Continued

We talk to companies everyday that are dealing with new challenges in Quality. In this video we will discuss common Quality issues and document the monetary value of SPC. We talk to companies everyday that are dealing with new challenges in Quality. Maybe you are frustrated with your current SPC methods and the time you … Continued

SPC tells when to leave the process alone and when to react. By using SPC, companies can minimize the variation of their process by identifying, reacting to and eliminating extra sources of variation. Implementing statistical process control (SPC) takes energy and resources, so companies had better be able to show a financial benefit for having … Continued

In an ever-competitive global marketplace, it’s more important than ever to develop systematic means to measure and manage costs of quality, which reflect business improvement opportunities. If there is a case being made for the importance of statistical process control software, A.V. Feigenbaum is making it. Feigenbaum, a well-known expert and author in the field … Continued