Downloaded from https://www.everyspec.com MIL-STD-31000A APPENDIX B B.1 INTRODUCTION. This is the Organizational Schema Standard for Model Base Definition (MBD). This schema document was developed to provide a set of reference standards and guidelines for the CAD user. It is intended to be the foundation for design development efforts. Previously, 3D CAD models had an accompanying 2D drawing. Now, with advances in CAD architecture, all product definition previously shown on a drawing is now defined and displayed directly in the 3D CAD model (See Figure 1). This is accomplished by utilizing a combination of annotations and naming conventions to organize the 3D solid model.
This makes the 3D model a single master source for obtaining product definition data and eliminates the need for a 2D drawing. Figure 1. The Documentation Journey. B.2 PURPOSE. This document defines recommendations and guidelines for the application and display management of the product definition data. This standard is necessary to establish a common method to facilitate access to the digital product definition data by downstream users. While this document was initially focused on mechanical piece part focused but the intent is for it to provide a foundation for use in any discipline The Schema document is designed to be compliant with ASME Y14.41 It is defined to work with any CAD system.
Note, illustrations in this book are for reference only and not intended to depict reliance to particular CAD software. The goal of this schema is to define a common practice to improve design productivity and to deliver consistent data to the customer. 36