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

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