Model-Based Definition (MBD, SOLIDWORKS)
Embedding tolerances, dimensions, and GD&T directly on the 3D model rather than relying on a separate 2D drawing.
🔗 Related Concepts
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Definition
SOLIDWORKS MBD lets you apply DimXpert annotations, datum references, and GD&T directly to a part's 3D faces. Annotation views control which annotations show in which orientations. Published 3D PDFs carry the model + annotations for downstream consumption.
Why it matters
MBD enables drawing-less workflows in aerospace, medical, and automotive contexts where the 3D model is the contractual master. It also reduces drawing maintenance overhead.
Common pitfalls
- Mixing MBD with traditional 2D drawings — duplicated and divergent tolerance specifications.
- Forgetting that not every fabricator can consume 3D PDF MBD — verify the supply chain's tooling first.
- Applying GD&T without a clear datum reference frame — produces unenforceable tolerances.
PMI as the authority, not the drawing
Model-Based Definition (MBD) attaches Product and Manufacturing Information — dimensions, GD&T, datums, surface finish, notes — directly to the 3D model as annotations organised on 3D Views. The 3D dataset becomes the authority, reducing or eliminating the 2D drawing. GD&T here follows ASME Y14.5 (2009/2018) or the ISO GPS system (e.g. ISO 1101), and MBD practice is codified in ASME Y14.41 and ISO 16792.
Publishing a consumable package
SOLIDWORKS MBD publishes to 3D PDF (with rotatable views and a parts list) and to STEP AP242, which — unlike AP203/AP214 — carries semantic PMI that downstream CMM and CAM tools can read programmatically. Validate that datums, tolerances, and surface finish survive the export before releasing, and organise 3D Views so each captures a coherent set of features for inspection.
References
Primary and vendor documentation used while writing this page (external links, not republished):
SOLIDWORKS Ecosystem Context
This concept is a core structural element of the SOLIDWORKS drafting and engineering environment developed by Dassault Systèmes. Dassault Systèmes' mainstream parametric MCAD — feature-based modelling, assembly mates, and 2D drawings tightly coupled to the 3D model.
Relevant SOLIDWORKS FAQs
❓ Is SOLIDWORKS available on macOS?
Not natively. SOLIDWORKS is Windows-only. Mac users run it via Parallels, VMware Fusion, or Boot Camp (Intel Macs). On Apple Silicon, virtualisation is limited. The official cross-platform alternative from Dassault is the browser-based xDesign on 3DEXPERIENCE.
❓ What's the difference between SOLIDWORKS Standard, Professional, and Premium?
Standard is the core modelling + drawings package. Professional adds CAD Library, PhotoView 360 rendering, eDrawings Professional, Toolbox, advanced sheet metal. Premium adds Simulation, Routing (electrical/piping), ScanTo3D, Motion. Most production shops use Premium; education usually uses Premium-equivalent.
❓ What is 3DEXPERIENCE SOLIDWORKS vs. traditional SOLIDWORKS?
Traditional SOLIDWORKS is a desktop product, files saved to disk/network/PDM. 3DEXPERIENCE SOLIDWORKS is the same desktop product but cloud-connected: files saved to the 3DEXPERIENCE platform, license tied to a Platform identity, and access to companion cloud apps (3D Sculptor / xDesign, simulation, PLM).
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🎓 Recommended Practice Lessons
Step-by-step practical exercises and certification-aligned paths chosen by our editors to master this concept:
SOLIDWORKS 3D CAD Specialization (Coursera)
SOLIDWORKS - Tutorial for Beginners in 13 MINUTES!
🌳 Semantic Crossroads & Navigation Pathways
Trunk-Branch-Leaf ModelExplore cross-referenced learning lanes. Connect this specific method back to macro CAD coordinate foundations, parent software environments, and sibling parameters in our shared taxonomy map.
Global Foundations
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Ecosystem Integration
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