Model Based Definition (MBD)

Model-based definition is an approach to creating 3D models so that they reliably contain all the data needed to define a product. With MBD, the model becomes the source authority that forms the basis for all development activities. This model can be used downstream by suppliers as well as across organisations within a company.

Using the methods of model-based definition, engineers now embed product data directly into 3D models, creating a reliable and universally valid data source for the entire team. The creation of 2D drawings is now a thing of the past, as form and position tolerances are already included in the 3D model. Errors in the creation of the 2D drawing can thus be avoided.

Prerequisite for use

The biggest hurdle for the use of MBD is the degree of digitisation of the company's suppliers. If they can only manufacture according to drawings, the benefits of MBD are not applicable. If, however, the manufacturer of the products can produce on the basis of 3D CAD data, you only need suitable software that allows the entry of form and position tolerances etc. in the 3D model, for example Solidworks, which also includes MBD in the standard licence. Since December 2020, MBD has also been integrated into the CAD software NX from Siemens.

Notes

33 per cent of a design's effort is spent on drafting. Imagine that this time could be used for a better design and thus increase your competitiveness
Embedded information in the 3D model can include, for example:

• Geometric dimensions and tolerances
• 3D annotations (text)
• Surface finish
• Material specifications

As the 3D model now contains all the manufacturing information, it can be transferred directly to modern manufacturing machines.

To realise the greatest value from MBD, companies should make it available to users throughout the enterprise.