Model-based definition: Difference between revisions

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'''Model-based definition''' ('''MBD'''), sometimes '''digital product definition''', is the practice of using [[3D modeling|3D models]] (such as solid models, 3D [[Product and manufacturing information|PMI]] and associated metadata) within 3D [[computer-aided drafting|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 [[bill of materials|bills of materials]], engineering configurations, design intent, etc. By contrast, other methodologies have historically required accompanying use of 2D [[engineering drawing]]s to provide such details. The general category of '''digital product definition''' ('''DPD''') can be either <ref>[[synonym|synonymous]] or [[hyponymy and hypernymy|hypernymous]] with http://model-based-enterprise.org/Docs/MIL-STD-31000A%20released%20on%20ASSIST%203%2013%202013.pdf definition;"MIL-STD-31000 itRev comprises all product definition that is [[digital data|digital]A"], whichp36, usually26 includes aFebruary 3D2013. modelRetrieved (andon thus23 MBD)April 2015.</ref>

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'''Model-based definition''' ('''MBD''') is the practice of using [[3D modeling|3D models]] (such as solid models, 3D [[Product and manufacturing information|PMI]] and associated metadata) within 3D [[computer-aided drafting|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 [[bill of materials|bills of materials]], engineering configurations, design intent, etc. By contrast, other methodologies have historically required accompanying use of 2D [[engineering drawing]]s to provide such details. The general category of '''digital product definition''' ('''DPD''') can be either [[synonym|synonymous]] or [[hyponymy and hypernymy|hypernymous]] with model-based definition; it comprises all product definition that is [[digital data|digital]], which usually includes a 3D model (and thus MBD).

==Use of the 3D digital data set==

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.<ref>Thilmany, Jean, [https://www.asme.org/engineering-topics/articles/design/digital-tolerance "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.", March 2011. Retrieved on 23 April 2015.</ref>

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 [[Numerical control|CNC machines]] to manufacture final product.

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==See also==

* [[CAD standards]]

* [[Product and manufacturing information|Product and manufacturing information (PMI)]]

==References==