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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 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.

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.

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]


External links[edit]

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

TCT Magazine + Personalize - News from the 3D Printing and Additive Manufacturing Industry (blog)
Wed, 15 Oct 2014 03:52:30 -0700

“With the emphasis on the direct-from-3D-model fabrication processes, it's important that we shift our focus to model-based definition so that we can shorten our overall design cycle and simplify the way we do things,” said Ryan Trulli, Mechanical ...
MCADCafe (press release) (blog)
Tue, 14 Oct 2014 10:15:00 -0700

Provides CAD format agnostic techniques for compliance with ASME Y14.41 and MIL-STD-31000A Model-Based Definition (MBD) and Technical Data Packages (TDP). The handbook provides 3D model protocols that enable Model-Based Engineering and ...
Manufacturers' Monthly
Sun, 21 Sep 2014 16:55:19 -0700

“With the emphasis on the direct-from-3D-model fabrication processes, it's important that we shift our focus to model-based definition so that we can shorten our overall design cycle and simplify the way we do things,” said Ryan Trulli, Mechanical ...

Design World Network

Design World Network
Tue, 07 Oct 2014 14:22:30 -0700

SolidWorks 2015 will also feature a new model-based definition (MBD) offering, which will enable design and manufacturing to share PMI information directly in 3D. This will no doubt be popular with government contractors, but might be a bit early for ...

Ten Links

Ten Links
Fri, 03 Oct 2014 09:52:30 -0700

This release also continues to meet Spatial's objective of making 3D models more intelligent by including increased PMI capabilities, advanced feature detection, and support for model-based engineering (MBE) / model-based definition (MBD). “Leveraging ...


Fri, 26 Sep 2014 02:51:50 -0700

さらに、新製品として「SOLIDWORKS Model-Based Definition(MBD)」を発表。この製品は、モデルそのものにPMI(製造情報)を定義することで2次元図面を削減し、製造工程の効率化やコスト削減などを実現するもの。まず、モデルに製造情報を追加していき、次に必要ビュー ...


Mon, 13 Oct 2014 07:26:15 -0700

“Con SolidWorks Model Based Definition, il modello 3D incorpora tutti i dati dimensionali necessari per produrre il pezzo. In questo modo si riducono la documentazione cartacea, il traffico di mail e il numero di file da gestire una volta completato il ...
iThome Online
Thu, 09 Oct 2014 23:33:45 -0700

SolidWorks 2015的200多項更新的功能中,也有新增的功能包括基於模型定義(Model Based Definition,MBD)、Inspection、企業產品開發管理(Enterprise PDM)的Web2等。 而MBD為協助企業定義、組織和發布3D產品製造資訊(PMI),包含工業標準檔案格式的3D ...

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