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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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87 news items


Mon, 16 Feb 2015 11:52:30 -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 ...
Business Wire (press release)
Wed, 11 Feb 2015 08:52:30 -0800

Model-based definition methodologies have been shown to reduce manufacturing errors and avoid the expense and time associated with developing 2D drawings, which can run up to 50 percent of total development costs,” said Gian Paolo Bassi, CEO, ...

MCADCafe (press release)

MCADCafe (press release)
Mon, 18 May 2015 23:11:15 -0700

“This year for instance, Jennifer Frady, PLM Engineering Administrator of Great Dane – one of our 3DViewStation users – offered a presentation on Model Based Definition (MBD),” Nikol explained. “Great Dane, a leading semi-trailer manufacturer, has ...

Quality Magazine

Quality Magazine
Sun, 01 Mar 2015 21:15:00 -0800

Advances in Model-Based Measurement Can Reduce CMM Programming Time. While manufacturers have applied model-based definition to product definition for some time, they have only recently applied it as a quality assurance process. By Larry ...
Quality Magazine
Tue, 08 Nov 2011 12:52:18 -0800

Take model based definition (MBD), a term and methodology long tossed around by software developers and the aerospace industry. Surprisingly, there is significant activity in this area, and genuine value this technology can bring to the manufacturing ...


Fri, 06 Mar 2015 01:40:14 -0800

Define PMI directly in 3D-1510 Společnost Dassault Systèmes představila bezvýkresovou výrobní aplikaci Solidworks Model Based Definition (MBD). Ta poskytuje konstruktérům 3D nástroj k vytváření modelů, zlepšuje technickou komunikaci, zrychluje ...

PR Newswire (press release)

PR Newswire (press release)
Wed, 10 Dec 2014 07:04:31 -0800

"With our combined capabilities of design and engineering tools utilizing multiple CAD systems and model based definition, as well as small to large machining, fabrication, assembly and system integration, we have significantly strengthened our turn ...

MCADCafe (press release) (blog)

MCADCafe (press release) (blog)
Fri, 05 Sep 2014 03:38:36 -0700

Model based definition (MBD), also known as 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 ...

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