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Model-based definition (MBD), sometimes digital product definition, 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.[1]

Use of the 3D digital data set[edit]

Modern 3D CAD applications allow for the insertion of engineering information such as dimensions, GD&T, notes and other product details within the 3D digital data set for components and assemblies. MBD uses such capabilities to establish the 3D digital data set as the source of these specifications and design authority for the product. The 3D digital data set may contain enough information to manufacture and inspect product without the need for engineering drawings. Engineering drawings have traditionally contained such information.[2]

In many instances, use of some information from 3D digital data set (e.g., the solid model) allows for rapid prototyping of product via various processes, such as 3D printing. A manufacturer may be able to feed 3D digital data directly to manufacturing devices such as CNC machines to manufacture final product.


In 2003, ASME published the ASME Y14.41-2003 Digital Product Definition Data Practices, which was revised in 2012 as ASME Y14.41-2012. The standard provides for the use of many MBD aspects, such as GD&T display and other annotation behaviors within the solid model. ISO-16792:2006 standardizes MBD within the ISO standards, sharing many similarities with the ASME standard. Other standards, such as ISO 1101:2004 and of AS9100 also make use of MBD.

In 2013, the United States Department of Defense released MIL-STD-31000 Revision A to codify the use of MBD as a requirement for technical data packages (TDP).

See also[edit]


  1. ^ "MIL-STD-31000 Rev A", p36, 26 February 2013. Retrieved on 23 April 2015.
  2. ^ Thilmany, Jean, "Digital Tolerance", "MBD is a method of annotating computer-aided design models with geometric and tolerancing information that allows engineers to draw directly onto a 3-D model.", ASME.org, March 2011. Retrieved on 23 April 2015.

External links[edit]

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Model-based_definition — Please support Wikipedia.
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121 news items

Quality Magazine

Quality Magazine
Wed, 04 Nov 2015 12:48:45 -0800

The central concept behind model-based definition (MBD) is that the digital model contains all of the detailed information necessary for all aspects of the product life cycle. This includes everything from design to manufacturing, in particular, GD&T data.

Ten Links

Ten Links
Fri, 06 Nov 2015 10:11:15 -0800

As a member, Action Engineering will contribute to the efforts of the DMSC to promote and expand the Quality Information Framework (QIF) for model-based engineering (MBE) and model-based definition (MBD) processes. QIF is an ANSI standard that ...

Design World Network

Design World Network
Mon, 23 Nov 2015 15:03:45 -0800

SolidWorks Model Based Definition enhancements help you quickly and accurately define, organize and publish manufacturing specifications directly in 3D to avoid 2D drawing ambiguity and downstream discrepancies. SolidWorks Visualize (formerly ...
MCADCafe (press release)
Thu, 29 Oct 2015 00:55:41 -0700

Theorem's Visualize 3D and Publish 3D suite of products, along with the latest versions of CADverter and Multi-CAD provide improved support for information supporting the Model Based Definition (MBD) process, helping to streamline manufacturing into a ...

SatNews Publishers

SatNews Publishers
Mon, 09 Nov 2015 12:37:19 -0800

Using Verisurf model-based definition inspection software, a laser tracker, and Leica T-Probe, all geometry, wall thicknesses, floor radius locations, hole positions, and diameters are confirmed within tolerances based the CAD model. The Leica T-Probe ...


Mon, 16 Feb 2015 11:53:15 -0800

Concept of Model Based Definition simply put is the definition or information of a product in an annotated 3D CAD model. The model annotation also referred to as Product Manufacturing Information (PMI), has to be organized in a consistent manner so ...
MCADCafe (press release)
Thu, 12 Nov 2015 00:03:45 -0800

Theorem's latest CADverter range of products now support the processing of Model Based Definition (MBD) information as standard. This is helping to streamlinethe manufacturing process into a paper free process by producing an information rich 3D CAD ...
MCADCafe (press release)
Mon, 09 Nov 2015 00:06:59 -0800

In certain products we provide support for the processing of Model Based Definition (MBD) information from native CAD in to a variety of CAD formats; Theorem's high quality, cost effective CADverter solutions help to solve the issue of working with and ...

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