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Metrology
Metrology is the science of measurement
Dimensional 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.
Aspects of Metrology
Reference standard metrology
Engineering Metrology
Basic Measurement Devices
Surface Plates
Test Stands
Dial Gages
Micrometers and Verniers
Gage Blocks
Dimensional Metrology Needs
Linear measurements
Angular measurements
Geometric form measurements
 Roundness
 Straightness
 Cylindricity
 Flatness, etc
Dimensional Metrology Needs
Geometric relationships
 Parallel, perpendicular, etc.
 Concentric, runout, etc.
Controlled surface texture
Communicating Dimensional
Metrology Needs
Geometric Dimensioning and
Tolerancing (GDT)
“The language of dimensional
metrology”
Standard symbols, etc., on part
drawings.
Specification of Linear
Tolerances
Angular Specifications
Angular Tolerances
Flatness Specification
Flatness Tolerances
Straightness Specification
Straightness Tolerance
Roundness Specification
Roundness applies to every section
Roundness Tolerances
Surface Profile Without
Datums
Line Profile Without Datums
Surface Profile with Datums
Profile of a line with datums is similar
Surface Profile with Datums
Cylindricity Specifications
Cylindricity Tolerances
Surface Texture Specification
Surface Texture
Perpendicularity Specification
Perpendicularity Measurements
Parallelism Specification
Parallelism Measurements
Concentricity Specification
Concentricity Tolerances
Concentricity Measurements
Concentricity Measurements
Circular Runout Specifications
Circular Runout Tolerances
Total Runout Specifications
Total Runout Tolerances
Position Specifications
Position Tolerances
Simulated Datum
Datum Selection

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