metrology metrology is the science of measurement dimensional metrology is that branch of metrology...
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Metrology
Metrology is the science of measurementDimensional metrology is that branch of Metrology which deals with measurement of “dimensions“ of a part or workpiece (lengths, angles, etc.)Dimensional measurements at the required level of accuracy are the essential link between the designers’ intent and a delivered product.
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Aspects of Metrology
Reference standard metrologyEngineering Metrology
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Basic Measurement Devices
Surface PlatesTest StandsDial GagesMicrometers and VerniersGage Blocks
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Dimensional Metrology Needs
Linear measurementsAngular measurementsGeometric form measurements Roundness Straightness Cylindricity Flatness, etc
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Dimensional Metrology Needs
Geometric relationships Parallel, perpendicular, etc. Concentric, runout, etc.
Controlled surface texture
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Communicating Dimensional Metrology Needs
Geometric Dimensioning and Tolerancing (GDT)“The language of dimensional metrology”Standard symbols, etc., on part drawings.
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Specification of Linear Tolerances
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Angular Specifications
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Angular Tolerances
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Flatness Specification
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Flatness Tolerances
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Straightness Specification
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Straightness Tolerance
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Roundness Specification
Roundness applies to every section
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Roundness Tolerances
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Surface Profile Without Datums
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Line Profile Without Datums
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Surface Profile with Datums
Profile of a line with datums is similar
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Surface Profile with Datums
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Cylindricity Specifications
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Cylindricity Tolerances
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Surface Texture Specification
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Surface Texture
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Perpendicularity Specification
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Perpendicularity Measurements
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Parallelism Specification
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Parallelism Measurements
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Concentricity Specification
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Concentricity Tolerances
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Concentricity Measurements
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Concentricity Measurements
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Circular Runout Specifications
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Circular Runout Tolerances
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Total Runout Specifications
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Total Runout Tolerances
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Position Specifications
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Position Tolerances
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Simulated Datum
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Datum Selection