Master Modeling: The Skeleton Architecture

To ensure high-level design agility and eliminate "broken references" in complex assemblies, Edelweis strictly employs Top-Down Design (TDD) via Skeleton Modeling. This methodology centralizes the design intent into a single control document, allowing for synchronized updates across multiple sub-systems.

1. The Skeleton Concept (The Source of Truth)

Instead of building parts in isolation, we initiate every project with a Master Skeleton Part (.SKE). This file contains the foundational "DNA" of the assembly:

  • Global Layout Sketches: Primary 2D planes and 3D wireframes defining the spatial boundaries.
  • Master Control Parameters: Global variables (e.g., Overall_Length, Critical_Clearance, Mounting_Pitch) that drive the geometry of all child components.
  • Reference Planes & Coordinate Systems: Precisely defined datums that serve as the anchor for every part in the ecosystem.

2. Propagation via Derived Geometry

We utilize Reference Surface Modeling to propagate data from the Skeleton to individual parts. This ensures a "one-way" flow of information, preventing circular references.

Surface Envelopes
Parts "wrap" around master surfaces derived from the skeleton, ensuring perfect fit-and-finish and zero interference.
Inter-Part Connectivity
If the master mounting points shift in the skeleton, the brackets and housings update their positions instantly.

3. Multi-Body Master (MBM) Workflow

For complex organic shapes or tightly integrated housings, we employ the Multi-Body Master technique:

  1. 01
    The "Big Block"

    The entire exterior volume is modeled as a single part to ensure aesthetic and ergonomic continuity.

  2. 02
    The Split

    The block is split into discrete functional bodies (Top Cover, Bottom Base, Internal Ribs) using assembly-wide parting lines.

  3. 03
    Part Extraction

    Each body is pushed into its own unique file, inheriting the master's parametric history for perfect mating logic.

4. Benefits for Enterprise Partners

  • Rapid Iteration: Design changes across 500+ drawings can be executed in hours by modifying the Master Skeleton.
  • Concurrent Engineering: Multiple engineers can work on different sub-systems simultaneously against locked interface points.
  • Simulation Stability: FEA/CFD meshes remain stable during iterations as underlying surface IDs are driven by a clean skeleton.

Technical Directives

Protocol Requirement
Reference Lock External references must be "Locked" or "Broken" before final production release to ensure archive stability.
Naming Hierarchy Skeleton features must use the SKE_ prefix for immediate identification in the feature tree.
Update Cycle Global updates must be triggered at the Top-Level Assembly to ensure full propagation across all PDM states.
Next Step: See how we manage these large-scale assemblies for maximum performance in Large Assembly Management.