Dimensional Metrology and Measurement Devices_狠狠撸s.ppt
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Metrology is the science of measurement. Dimensional metrology deals with measuring dimensions like lengths and angles of parts. Accurate dimensional measurements are key to ensuring a product matches its design intent. Dimensional metrology involves measuring linear dimensions, angles, geometric forms like roundness and flatness, geometric relationships, surface texture, and more. Geometric Dimensioning and Tolerancing (GDT) uses standard symbols on drawings to specify dimensional requirements.
Dimensional Metrology and Measurement Devices_狠狠撸s.ppt
- 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.
- 14. Roundness Specification Roundness applies to every section
- 17. Line Profile Without Datums
- 18. Surface Profile with Datums Profile of a line with datums is similar
- 19. Surface Profile with Datums
- 23. Surface Texture
- 38. Simulated Datum
- 39. Datum Selection