Spc manual 3rd edition pdf. Download Aiag Spc Manual 3rd Edition PDF Book

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Aiag msa 4th ed

spc manual 3rd edition pdf

For example, the components of variation can include any combination of the items shown in I-B 1. What is the purpose and how will the measurement result be used? Chapter I — Section B The Measurement Process 17 Figure I-B 1: Measurement System Variability Cause and Effect Diagram MeasurementSystem VariabilityStandard Workpiece Part Instrument Gage EnvironmentPerson Appraiser geometric compatibility coefofthermal expansion elasticproperties calibration stability elastic deformation supporting features elastic properties mass cleanliness interrelated characteristics hidden geometry operational definition adequate datums skill limitations experience training understanding training experience attitude physical educational vibration temperature standard vsambient equalization-- systemcomponents traceability airpollution ergonomics lighting stress cycles thermal expansion sun components airdrafts people lights artificial designamplification contact geometry deformation effects build maintenance bias variability stability linearity repeatability reproducibility sensitivity consistency uniformity calibration p. To ensure that the benefit derived from using measurement data is great enough to warrant the cost of obtaining it, attention needs to be focused on the quality of the data. Then and only then will the process be properly used, supported and improved upon. This is one example of the funnel experiment that Dr. Unfortunately, measurement systems with such desirable statistical properties seldom exist, and so process managers are typically forced to use measurement systems that have less desirable statistical properties. P 15 This chapter was written with the team philosophy in mind.

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Aiag msa 4th ed

spc manual 3rd edition pdf

For instance, the decision to adjust a manufacturing process is now commonly based on measurement data. Chapter I — Section B The Measurement Process 18 The Effects of Measurement System Variability Because the measurement system can be affected by various sources of variation, repeated readings on the same part do not yield the same, identical result. Proven measurement methods may provide more reliable operation. Consider a situation where the weight of a precious metal coating on a part is being controlled to a target of 5. The customer and supplier s need to thoroughly understand the project requirements, what the deliverables will be and the methods by which both are to be achieved.

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Aiag msa 4th ed

spc manual 3rd edition pdf

In general, an analytic study is one that increases knowledge about the system of causes that affect the process. This is equivalent to using the multiplier of 6 in the historical approach. Since documentation is a form of communication, the team and others ought to be involved at every level of the development of the measurement process documentation package. Any measurement system may require more or less strategic planning and scrutiny depending on a given product or process situation. If the measurement system used at either location is not consistent with the measurement system that will be used under normal circumstances then confusion may ensue.

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AIAG

spc manual 3rd edition pdf

Use of standard ized components or subassemblies also leads to interchangeability, flexibility, reduced cost and, generally, less long-term measurement error. These guidelines serve to communicate acceptable standards. Here are some guidelines: The team needs to evaluate the design of the subsystem or component and identify important characteristics. When a qualified laboratory is not available for a given piece of equipment, calibration services may be performed by the equipment manufacturer. Remember to use data to substantiate common assumptions about the measurement process. But purchasing the best or the latest measurement technology will not necessarily guarantee correct production process control decisions. Each calibration event includes all of the elements necessary including standards, measurement and test equipment being verified, calibration methods and procedures, records, and qualified personnel.

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AIAG Production Part Approval process PPAP 4th Edition

spc manual 3rd edition pdf

The significance that documentation takes with any successful project is often misunderstood. The operating instructions require the operator to verify the weight at setup and every hour based on one sample. The data, or some statistic calculated from them, are compared with statistical control limits for the process, and if the comparison indicates that the process is out of statistical control, then an adjustment of some kind is made. Chapter I — Section B The Measurement Process 16 presenting and categorizing these sources of variation such as cause-effect diagrams, fault tree diagrams, etc. Management must therefore also provide clear operational definitions and standards as well as training and support. For instance, suppose that a measurement system, operating under stable conditions, is used to obtain several measurements of a certain characteristic.

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Download Aiag Spc Manual 3rd Edition PDF Book

spc manual 3rd edition pdf

The manual is an introduction to measurement system analysis. Any and all of the management, statistical, and logical techniques of process control can be applied to it. Process control Is the process variation stable and acceptable? Deming referred to this type of measurement and decision-making as tampering. If the interaction generates too much variation, then the quality of the data may be so low that the data are not useful. For example, it will suggest to the user how to get from one point to another user instructions or gage instructions. For example, measurement may start on a product characteristic to establish stability and capability of the process. There are various methods of 6 The measurement analyst must always consider practical and statistical significance.

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AIAG

spc manual 3rd edition pdf

Management is also responsible for ensuring that those properties are used as the basis for selecting a measurement system. Unfortunately, the true value can never be known with certainty. Following that is a section which addresses its impact on the process decision. Not all product and process characteristics require measurement systems whose development falls under this type of scrutiny. Historically, it would be determined if the part were acceptable within specification or unacceptable outside specification. Data collection methods and maintenance recommendations related to these activities can be obtained from the original manufacturer, or developed by plant engineering, manufacturing and quality personnel.

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AIAG

spc manual 3rd edition pdf

Heaphy, The Third Generation, 1987, 1998. That is, the measurement process is in statistical control and has zero bias. This adds stability and consistency to the measurement system capability. The quality of a measurement system is usually determined solely by the statistical properties of the data it produces over time. The commonly known Rule of Tens, or 10-to-1 Rule, states that instrument discrimination should divide the tolerance or process variation into ten parts or more. Conducting preventive maintenance on a stable system, based on time series information, will be less wasteful than conducting preventive maintenance on a system with traditional techniques.

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Download Aiag Spc Manual 3rd Edition PDF Book

spc manual 3rd edition pdf

Most of the measuring and monitoring could eventually end up at suppliers of incoming material. Documentation is sometimes overlooked when acquiring a measurement process. Under a product control philosophy this classification activity would be the primary reason for measuring a part. The difference in the observed Cp of 1. Four rules of the funnel experiment are: Rule 1: Make no adjustment or take no action unless the process is unstable.

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AIAG Production Part Approval process PPAP 4th Edition

spc manual 3rd edition pdf

To better develop this concept, several questions need to be answered. Chapter I — Section D Measurement Source Development 30 Datum Coordination by both parties. Rule 4: Adjust the process to the point of the last measurement. There may be times when a datum scheme used in a final assembly cannot possibly match that used in a sub-component manufacturing process. Management must provide the resources to purchase equipment which is necessary and sufficient to do this.

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