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Datums, Machining and Surface Texture Symbols
Geometrical and Mechanical Drawing · Chapter 12 · (g) Datums, machining and surface texture symbols
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Topics 3
- Reference points and planes (datums) in dimensioning; chain, parallel (datum) and combined dimensioning
- Machined and unmachined surfaces; machining symbols and machining allowance
- Surface texture: roughness value (Ra), lay, and the complete surface texture symbol on drawings