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      Short-Run SPC for Manufacturing and Quality Professionals

      DOI link for Short-Run SPC for Manufacturing and Quality Professionals

      Short-Run SPC for Manufacturing and Quality Professionals book

      Short-Run SPC for Manufacturing and Quality Professionals

      DOI link for Short-Run SPC for Manufacturing and Quality Professionals

      Short-Run SPC for Manufacturing and Quality Professionals book

      ByWilliam A. Levinson
      Edition 1st Edition
      First Published 2022
      eBook Published 15 September 2022
      Pub. Location New York
      Imprint Productivity Press
      Pages 96
      eBook ISBN 9781003281061
      Subjects Economics, Finance, Business & Industry, Engineering & Technology, Mathematics & Statistics
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      Levinson, W.A. (2022). Short-Run SPC for Manufacturing and Quality Professionals (1st ed.). Productivity Press. https://doi.org/10.4324/9781003281061

      ABSTRACT

      On the manufacturing shop floor, the principle of "value comes from the production of parts rather than charts" crucially applies when using practical statistical process control (SPC). The production worker should need to enter only a sample's measurements to get immediately actionable information as to whether corrective action (e.g. as defined by a control plan's reaction plan) is necessary for an out of control situation, and should not have to perform any calculations, draw control charts, or use sophisticated statistical software. This book's key benefit for the readers consists of spreadsheet-deployable solutions with all the mathematical precision of a vernier along with the simplicity of a stone ax. Traditional statistical process control (SPC) relies on the assumption that sufficient data are available with which to estimate the process parameters and set suitable control limits. Many practical applications involve, however, short production runs for which no process history is available. There are nonetheless tested and practical control methods such as PRE-Control and short-run SPC that use the product specifications to set appropriate limits. PRE-Control relies solely on the specification limits while short-run SPC starts with the assumption that the process is capable -- That is, at least a 4-sigma process, and works from there to set control limits. Cumulative Sum (CUSUM) and exponentially weighted moving average (EWMA) charts also can be used for this purpose. Specialized charts can also track multiple part characteristics, and parts with different specifications, simultaneously. This is often useful, for example, where the same tool is engaged in mixed-model production. Readers will be able to deploy practical and simple control charts for production runs for which no prior history is available and control the processes until enough data accumulate to enable the traditional methods (assuming it ever does). They will be able to track multiple product features with different specifications, and also control mixed-model applications in which a tool generates very short runs of parts with different specifications. The methods will not require software beyond readily available spreadsheets nor will they require specialized tables that are not widely available. Process owners and quality engineers will be able to perform all supporting calculations in Excel, and without the need for advanced software.

      TABLE OF CONTENTS

      Chapter 1. PRE-Control  Chapter 2. Introduction to Short Run SPC Chapter 3. Cumulative Sum (CUSUM) Chart Chapter 4. Charts for Multiple Nominals Chapter 5. Acceptance Control Charts *

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