Model based definition
Encyclopedia
Model based definition also known as digital product definition (DPD), is the practice of using 3D digital data (such as solid models and associated metadata) within 3D CAD software to 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 drawings to provide such details.
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.
Digital Product Definition Data Practices. The standard provides for the use of some MBD aspects, such as GD&T within the solid model. Other standards, such as ISO 1101:2004 and of AS9100 also make use of MBD.
Geometric dimensioning and tolerancing
Geometric dimensioning and tolerancing is a system for defining and communicating engineering tolerances. It uses a symbolic language on engineering drawings and computer-generated three-dimensional solid models for explicitly describing nominal geometry and its allowable variation...
(GD&T), component level materials, assembly level bills of materials
Bill of materials
A bill of materials is a list of the raw materials, sub-assemblies, intermediate assemblies, sub-components, components, parts and the quantities of each needed to manufacture an end product...
, engineering configurations, design intent, etc. By contrast, other methodologies have historically required accompanying use of 2D drawings to provide such details.
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.In many instances, use of some information from 3D digital data set (e.g., the solid model) allows for rapid prototyping
Rapid prototyping
Rapid prototyping is the automatic construction of physical objects using additive manufacturing technology. The first techniques for rapid prototyping became available in the late 1980s and were used to produce models and prototype parts. Today, they are used for a much wider range of applications...
of product via various processes, such as 3D printing
3D printing
3D printing is a form of additive manufacturing technology where a three dimensional object is created by laying down successive layers of material. 3D printers are generally faster, more affordable, and easier to use than other additive manufacturing technologies. However, the term 3D printing is...
. A manufacturer may be able to feed 3D digital data directly to manufacturing devices such as CNC machines
Numerical control
Numerical control refers to the automation of machine tools that are operated by abstractly programmed commands encoded on a storage medium, as opposed to controlled manually via handwheels or levers, or mechanically automated via cams alone...
to manufacture final product.
Standardization
In 2003, ASME published the ASME Y14.41-2003ASME Y14.41-2003
- What is ASME Y14.41 :The American Society of Mechanical Engineers issued the first version of this industrial standard on Aug 15, 2003. It was immediately adopted by several industrial organizations, as well as the Department of Defense...
Digital Product Definition Data Practices. The standard provides for the use of some MBD aspects, such as GD&T within the solid model. Other standards, such as ISO 1101:2004 and of AS9100 also make use of MBD.