Functional Tolerancing & Annotation (FTA, CATIA)
CATIA's GD&T workbench — applies geometric and dimensional tolerances directly on the 3D model per ASME Y14.5 / ISO 1101 / GPS.
🔗 Related Concepts
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Definition
FTA lets the user apply tolerances (datum references, position, profile, perpendicularity, flatness, runout) directly on 3D faces of a CATPart. Annotation views control which tolerances display in which orientations. The toleranced model can drive both 3D PDF and Generative Drafting.
Why it matters
Model-Based Definition (MBD) workflows in aerospace and automotive require tolerances embedded in the 3D model. FTA is the CATIA implementation of MBD.
Common pitfalls
- Tolerances on faces without a clear datum reference frame — unenforceable.
- Mixing MBD with traditional 2D drawing tolerances — duplicate and divergent.
- FTA-only delivery to a fabricator who can't consume 3D PDFs — communication failure.
CATIA Ecosystem Context
This concept is a core structural element of the CATIA drafting and engineering environment developed by Dassault Systèmes. Dassault Systèmes' high-end PLM-grade CAD — the production tool of aerospace, automotive, and class-A surface modelling.
Relevant CATIA FAQs
❓ What's the difference between CATIA and SOLIDWORKS, both Dassault products?
Different markets. SOLIDWORKS is mid-market mechanical CAD (industrial machinery, consumer products). CATIA is high-end (aerospace, automotive, very large assemblies, class-A surfacing). CATIA's learning curve, price, and capability are substantially higher.
❓ Is CATIA available for individual hobbyists?
No. CATIA is sold through VARs to enterprises and educational institutions. Hobbyists looking for similar capability use Rhino (surfacing), Plasticity (modern direct modelling), Onshape (cloud), or older perpetual versions of SOLIDWORKS via student licenses.
❓ What is the difference between V5 and V6?
V5 is the file-based desktop platform (still widely used). V6 was the predecessor to 3DEXPERIENCE — server-stored on ENOVIA V6. CATIA on 3DEXPERIENCE is the current 'V6'-equivalent track. Many organisations run both V5 and 3DX in parallel.
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🎓 Recommended Practice Lessons
Step-by-step practical exercises and certification-aligned paths chosen by our editors to master this concept:
CATIA V5 Complete Professional Course (Udemy)
🌳 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
Core glossary, interactive graph, and domain-wide concept index.
Ecosystem Integration
Parent design environments and platforms implementing this method natively.
Active Context & Neighbors
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