Case Studies and White Papers
EDM fast hole drilling is one of the most important variations of electrical discharge machining. The process plays an important role in the aerospace industry as it is one of the few that can be applied to the drilling of precision small holes in a number of parts, including turbine blades. One of the most important factors affecting the speed of EDM fast hole drilling is the high pressure dielectric fluid, which is usually supplied to the gap through the bore to tubular electrodes. Thus, it can be expected that the bore size and geometry have a great impact on the process performance. However, there has not been much research on this topic. By employing statistical methods to optimise the process performance, this work shows that drilling time and electrode wear can decrease 165% and 25% respectively, depending on the type of electrode geometry used.
DOE for Coatings
This article provides an introduction to design of experiments (DOE) for improvement of coatings processes and formulations. It includes a case study on a spin-coater.
PCR Process Optimized via Split-Plot DOE
This paper illustrates the use of design of experiments (DOE) and split-plot design to quickly and effectively determine the factor settings that maximize amplification in a polymerase chain reaction (PCR) experiment.
Screening Process Factors In The Presence of Interactions
This article introduces a new, more efficient type of fractional two-level factorial design of experiments (DOE) tailored for the screening of process factors. These designs are referred to as Min Res IV.
How to Use Graphs to Diagnose and Deal with Bad Experimental Data
This article deals with thorny issues that confront every experimenter how to handle individual results that do not appear to fit with the rest of the data. (A somewhat modified version of this article was published in Quality Engineering. April 2007.)
This article offers a simple case study that illustrates how to put rubber or plastics formulations to the test by using powerful statistical methods for mixture design and analysis. Rubber & Plastics News.
This technical paper details a new class of high-resolution (V) minimum-run two-level factorial designs that characterize two-factor interactions with far fewer runs than classical templates. These "MR5" designs serve well as the core for central composite designs that reduce the number of runs needed for response surface methods.
Power tells us the probability of rejecting the null hypothesis for an effect of a given size and helps us select an appropriate design prior to running the experiment. This paper describes a general approach for sizing effects that covers a wide variety of designs. Quality and Reliability Engineering International.
How to Save Runs, Yet Reveal Breakthrough Interactions, By Doing Only a Semifoldover on Medium-Resolution Screening Designs
Via case studies, this paper reviews the strategy of foldover on low-resolution (III) two-level fractional factorials and demonstrates how to reduce experimental runs by making use of semifoldover methods to augment medium-resolution (IV) designs.
Achieving Six Sigma Objectives for Variability Reduction in Formulation and Processing
Apply powerful design of experiments (DOE) tools to make your system more robust to variations in component levels and processing factors.