Downloaded from https://www.everyspec.com MIL-STD-31000A APPENDIX B B.7.2 Logical Groups. This schema uses Logical Groups to manage the display of annotation data and support definition for combination views. Logical Groups support model display requirements for combination Views to comply with ASME Y 14.41-2003 section 5.1.1. One can organize and control product data items by assigning them to Logical Groups. In many CAD software one can hide and show Logical Groups as necessary, which allows one control the display of multiple data items simultaneously. For example, one can assign notes to a specific layer and then show/hide them as desired with other data.
Using Logical Groups, one can organize items and streamline selection because all the layer items are treated as a group. Logical Groups can include other items in a CAD system’s database such as features, dimensions, notes, geometric tolerances, and other Logical Groups. Figure 8 shows an example of the use of Logical Groups in this case layers in an annotated assembly model. The naming convention should be MBD#_Description (should coincide with Combination Views). One exception is Assembly only Logical Groups which should be named MBDA#_Description to aid in display control on higher level assemblies. Figure 8. Layer Tree. 41