Model-Based Definition We welcome your MBD files What is Model-based definition (MBD)? Model-based definition (MBD) sometimes called digital product definition (DPD), is the practice of using 3D models (such as solid models, 3D PMI and associated metadata) within 3D CAD software to define (provide specifications for) individual components and product assemblies. The types of information […]

Model-Based Definition

We welcome your MBD files

What is Model-based definition (MBD)?

Model-based definition (MBD) sometimes called digital product definition (DPD), is the practice of using 3D models (such as solid models, 3D PMI and associated metadata) within 3D CAD software to define (provide specifications for) individual components and product assemblies. The types of information included are geometric dimensioning and tolerancing (GD&T), component level materials, assembly level bills of materials, engineering configurations, design intent, etc. By contrast, other methodologies have historically required accompanying use of 2D engineering drawings to provide such details.

Model-based definition is an approach to creating 3D models so that they effectively contain all the data needed to define a product. With MBD, the model becomes the source authority that drives all engineering activities. This model may further be used downstream by suppliers and across organizations within an enterprise.

Why MBD?

For years, engineers used 2D drawings to deliver product manufacturing information—even as they designed models in 3D. Now, using model-based definition (MBD) methods, engineers embed product data directly in the 3D models, creating a single, reliable source of truth for the whole extended team that prevents errors and saves everybody time.

MBD is simply way more efficient and reliable to produce the PMI or annotations on the CAD model than it is to transfer to a drawing format that often requires a different environment in the CAD system often requiring a different set of menus. So, MBD PMI is just faster and it is simply more clear; easier to visualize, and understand.

When reading blueprints – we have to go back to reading various section and detail views often scattered on multi-sheet drawings. Finding the details of any one feature is often unclear especially when sections can become very complex zig-zag sections, sometimes defined on separate sheets and then sometimes rotated by some angle all in the intent to clarify what is going on with the section. With the technology in MBD, far fewer section or detail views are needed and even if such views are created, they are just easier to visualize, understand, and read in a dynamic 3D model. Each feature involved with such views is much more identifiable and on many CAD systems, the section detail can be echoed on and off for additional clarification.

Version Control

The 3D model is infinitely better at version control. Companies, for years and years, have struggled with how to keep their drawings directly associated with their models. Thus, enter the PDM systems (and now PKM, PLM) in order to keep that connectivity going on. However, 2D pdfs of CAD drawings get pulled down from the system and often all stand-alone and unconnected once pulled down from their container.

We Are Ready

DigiPart is ready for your MBD files, containing all of your GD&T and PMI! By using us, you can reduce your engineering workload and get higher quality by cutting out opportunities for human error, introduced during 2D CAD drawing generation. Please contact us today to discuss how we can work together with model-based definition to manufacture your machine parts.

Highlights

Define 3D measurement objects and construction geometry, along with their characteristics and controlled dimensions, associative with the CAD design geometry and its native GD&T (Geometric Dimensioning and Tolerancing.)

Set up specialized characteristics to obtain feature location, surface, and edge deviations, and tie them to assembly, tooling, or datum coordinate systems.

Just as the move from 2D design tools to 3D CAD solutions revolutionized product development, the emergence of 3D model-based definition (MBD) integrated manufacturing technology offers substantial productivity advantages over the use of traditional 2D engineering drawings to drive manufacturing.

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