Product Manufacturing Information (PMI, NX)
NX's MBD toolset — apply dimensions, tolerances, GD&T, and notes directly on the 3D model.
🔗 Related Concepts
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Definition
PMI (sometimes called GD&T in NX speak) applies dimensions, tolerances, datum references, surface finishes, and notes to 3D faces. Annotation views control visibility per orientation. Combined Views package camera + PMI visibility + section state for sheet-like display. PMI exports to 3D PDF, JT, and STEP AP242.
Why it matters
Model-Based Definition is increasingly required in aerospace, automotive, and medical supply chains. PMI is NX's implementation, mature and widely deployed.
Common pitfalls
- PMI on faces without datum reference frames — unenforceable tolerances.
- Mixing PMI with 2D drawings — duplicate spec definitions.
- Combined Views with stale geometry references after model edits.
Siemens NX Ecosystem Context
This concept is a core structural element of the Siemens NX drafting and engineering environment developed by Siemens Digital Industries Software. Siemens' high-end CAD/CAM/CAE platform — synchronous + parametric hybrid modelling, strong CAM, and Teamcenter PLM integration.
Relevant Siemens NX FAQs
❓ What is the difference between NX and UG?
Same product, different name. UG (UniGraphics) is the legacy name from 1973 until 2002, when Siemens (then EDS) rebranded to NX. Veteran users still say 'UG.' The .prt file format is continuous across the rename — UG files can open in modern NX.
❓ What is Synchronous Technology and why does NX have it?
ST is direct-face editing on a body without disturbing parametric history. NX has it because it solves two pain points: editing imported geometry without history, and editing native parts when parametric edits would be tedious. Mixing ST with parametric is uniquely NX's capability.
❓ Does NX require Teamcenter?
Not technically — NX can run with the native filesystem. But production deployments almost always use Teamcenter (or NX X with Teamcenter X for cloud). Without it, large-assembly performance and revision control become unmanageable.
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🎓 Recommended Practice Lessons
Step-by-step practical exercises and certification-aligned paths chosen by our editors to master this concept:
NX WAVE Geometry Linker and Large Assemblies (Siemens Academy)
🌳 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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