Defining Model Based Definition

摘要

With model-based definition (MBD), a 3D CAD model is the sole reference object for all details and specifications regarding a part, sub-assembly, product or tool. In its purest form, no other documentation is referenced when describing the characteristics and qualities of an object. So, MBD is an approach where the CAD file provides much more than a description of the design intent.rnIn the realm of inspection-related activities, MBDs supply all of the dimensional and tolerance information. There are no drawings. The CAD model contains all of the specifications, including the geometric dimensioning and tolerancing (GD&T) callouts. The dimensional specifications may be either annotations within the model file or digital specifications linked to a feature. With the latter approach, inspections are completed simply by referencing the CAD model and picking the appropriate points on the object. This eliminates all manual documentation and data entry and expedites the inspection process.