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OVERVIEW OF SPC

OVERVIEW OF SPC. BPT 2423 – STATISTICAL PROCESS CONTROL. INTRODUCTION. Buying Products. Produced by a process that is stable or repeatable . Process must be capable of operating with little variability around the target or nominal dimensions of the product’s quality characteristics.

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OVERVIEW OF SPC

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  1. OVERVIEW OF SPC BPT 2423 – STATISTICAL PROCESS CONTROL

  2. INTRODUCTION Buying Products Produced by a process that is stable or repeatable Process must be capable of operating with little variability around the target or nominal dimensions of the product’s quality characteristics

  3. USE OF SPC IN QUALITY • SPC is most effective when it is integrated into an overall companywide quality improvement program • To improve quality and productivity – start with managing facts and data and not simply rely on judgment Processes do not naturally operate in an in-control state Use of control charts in an SPC program To eliminate assignable causes, reduce process variability and stabilize process performance

  4. USE OF SPC IN QUALITY Products Process Flow Process Data Process Control

  5. USE OF SPC IN QUALITY Chance and Assignable Causes • Chance / Common Causes • small random changes in the process that cannot be avoided – due to the inherent variation present in all processes • only removable by making a change in the existing process – involves management intervention • Example : temperature in the factory building • Assignable Causes • variations in the process that can be identified as having a specific cause (causes that are not part of the process on a regular basis) • variation arises because of specific circumstances • Example : changes in the thickness of incoming raw material, broken tool • Source of variation : process itself, the material used, the operator’s actions or the environment

  6. USE OF SPC IN QUALITY • Elements of a Successful SPC Program • Management leadership • A team approach, focusing on project-oriented applications • Education of employees at all levels • Emphasis on reducing variability • Measuring success in quantitative (economic) terms • A mechanism for communicating successful results throughout the organization

  7. APPLICATION OF SPC

  8. APPLICATION OF SPC Statistical Process Control Nonmanufacturing / Service Businesses Manufacturing

  9. APPLICATION OF SPC • Service industry applications of SPC and related methodology sometimes require ingenuity beyond that normally required for the more typical manufacturing applications. • Two primary reasons for this difference : • Most service businesses do not have a natural measurement system that allows the analyst to easily define quality • The system that is to be improved is usually fairly obvious in a manufacturing setting, whereas the observability of the process in a nonmanufacturing setting may be fairly low • Key to applying SPC in a nonmanufaturing environment is to focus initial efforts on resolving these two issues.

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