Downloaded from https://www.everyspec.com MIL-STD-31000A APPENDIX B B.7.5 Annotations. An annotation is a note-type entity created to store model information without geometry. Annotation elements and features allow the user to define dimensions and supporting data in 3D space. They can be parametric and will rotate with the model (Figure 11). Annotations are used to provide complete product definition to comply with ASME Y14.41 section 3. Figure 11. Annotations. Annotations can exist independently within the model, or be included in a feature. Each annotation data type should be placed on an appropriate layer and orientation plane corresponding to the view it represents:
Driving Dimensions are model dimensions created and owned by features. Driven Dimensions are used to measure the size and shape of features within a model. The value of a driven dimension changes when the size and shape of the features are modified. But they are not used to define or modify the feature geometry. Driven dimensions can have tolerances, to which manufactured components can be accepted or rejected. Notes are text strings that can either placed as a fixed note or attached to an object. One can place any number of notes in a model and orient them in multiple orientations.
Symbols are collections of draft geometry and text that either serve as a simple labeling object, or that represent more complicated objects such as assemblies or electrical components. The symbol may show parameters as text notes. When the instance is placed, the parameters read the values associated with the drawing. Geometric Tolerances (GTOLs) provide a comprehensive method of specifying where on a part the critical surfaces are, how they relate to one another, and how the part must be inspected to determine if it is acceptable. They provide a method for controlling the location, form, profile, orientation, and run out of features.
Surface Finishes are associated with surfaces in the part. Each surface symbol applies to the entire surface. One can add surface finish symbols to a model using standard surface finish symbols available in most CAD tools, or One can create and save Owner own surface finish symbols. 44