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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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261 news items


Thu, 28 Jan 2016 05:56:17 -0800

Model-based definition, or MBD, lets you place the dimensions and notes right on the 3D model. Tradition is not always bad, but if it gets in the way of truth, it's time to reconsider. Traditional drafting practices have us creating 2D views of 3D ...


Mon, 08 Feb 2016 11:37:18 -0800

The last 15 years have seen a significant push toward model-based definition (MBD), sometimes called digital product definition (DPD). More and more manufacturers are trading master parts for master CAD models with embedded tolerancing, which makes ...


Fri, 05 Feb 2016 09:22:22 -0800

Though modeling is at the foundation of CAD, drawings and increasingly model-based definition (MBD) is just as critical as the models themselves. In SOLIDWORKS 2017, section views have been enhanced by providing an option for them to be highlighted ...


Mon, 25 Jan 2016 16:25:06 -0800

“With the increased use of MBD [model based definition] and ECO [engineering change order] management, validation of CAD data has become much more important in the manufacturing world today,” stated Kentaro Fukuta, general manager of global ...

Modern Machine Shop (blog)

Modern Machine Shop (blog)
Wed, 20 Jan 2016 02:07:30 -0800

Use model-based definition. Design parts and automatically embed tolerances in the model. By doing so, product development can be streamlined. Use automation. Automating routine tasks enables personnel to concentrate on more intricate, complex and ...


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 ...

Quality Magazine

Quality Magazine
Wed, 04 Nov 2015 12:55:18 -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.

Quality Magazine

Quality Magazine
Sun, 01 Mar 2015 21:16:22 -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. prev. next.

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