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# Assembly

In product design stages, precise part modeling and establishing correct assembly mates are critical for ensuring manufactured product quality. Only with accurate dimensions and proper fit relationships can subsequent processes like dynamic assembly simulation, interference checking, and design optimization be effectively performed.

CrownCAD's Assembly Module provides intuitive 3D mating relationships, enabling seamless transition from parts to assemblies. Its Top-down Design methodology synchronizes assembly and part modifications, accelerating iterative design.

Creating Assemblies, Access the assembly interface via:

In Document Manager: Click "New Document".
Select "Assembly" as document type.
Enters assembly environment upon creation.

Core Assembly Functions:

Insert Components: Fast search & placement (Free/Origin positioning).
Edit Components: Direct editing in assembly context (identical to part modeling).
Standard Part Library: GB-compliant fasteners for quick insertion.
Mates: Apply constraints (Coincident, Parallel, Tangent, Concentric) between:
- Faces/Edges
- Datum Planes/Axes
- Points
Patterns: Linear/Circular component duplication.
Interference Check: Detect part collisions instantly.

Assembly Feature Tree Structure:

Instances: Lists inserted components by name.
Mates: Highlights relevant constraints when selecting components.
Features: Manages assembly-level features (e.g., Patterns).

Right-click Context Menu:

Jump to Part: Directly edit sub-components.
Unload/Reload: Manage component memory usage.
Show/Hide: Toggle component visibility.
Apply Material: Assign physical properties.