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Metrology

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.)

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Metrology

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  1. 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.

  2. Aspects of Metrology • Reference standard metrology • Engineering Metrology

  3. Basic Measurement Devices • Surface Plates • Test Stands • Dial Gages • Micrometers and Verniers • Gage Blocks

  4. Dimensional Metrology Needs • Linear measurements • Angular measurements • Geometric form measurements • Roundness • Straightness • Cylindricity • Flatness, etc

  5. Dimensional Metrology Needs • Geometric relationships • Parallel, perpendicular, etc. • Concentric, runout, etc. • Controlled surface texture

  6. Communicating Dimensional Metrology Needs • Geometric Dimensioning and Tolerancing (GDT) • “The language of dimensional metrology” • Standard symbols, etc., on part drawings.

  7. Specification of Linear Tolerances

  8. Angular Specifications

  9. Angular Tolerances

  10. Flatness Specification

  11. Flatness Tolerances

  12. Straightness Specification

  13. Straightness Tolerance

  14. Roundness Specification Roundness applies to every section

  15. Roundness Tolerances

  16. Surface Profile Without Datums

  17. Line Profile Without Datums

  18. Surface Profile with Datums Profile of a line with datums is similar

  19. Surface Profile with Datums

  20. Cylindricity Specifications

  21. Cylindricity Tolerances

  22. Surface Texture Specification

  23. Surface Texture

  24. Perpendicularity Specification

  25. Perpendicularity Measurements

  26. Parallelism Specification

  27. Parallelism Measurements

  28. Concentricity Specification

  29. Concentricity Tolerances

  30. Concentricity Measurements

  31. Concentricity Measurements

  32. Circular Runout Specifications

  33. Circular Runout Tolerances

  34. Total Runout Specifications

  35. Total Runout Tolerances

  36. Position Specifications

  37. Position Tolerances

  38. Simulated Datum

  39. Datum Selection

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