⚖️ Weight & Center of Gravity

Fixture Stability and Load Analysis
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Overview

Critical for fixture stability analysis, forklift handling, and positioner load verification.

AnalysisPurpose
Part WeightVerify positioner capacity
Center of GravityBalance analysis, tip-over risk
Combined WeightFixture + part + hardware total

Part Weight Calculation

Calculation Flow

WEIGHT CALCULATION ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ │ Solid Body │────▶│ sld ask bod │────▶│ Volume (m³) │ │ │ │ vol │ │ │ └─────────────┘ └─────────────┘ └──────┬──────┘ │ ┌─────────────┐ │ │ Material DB │◀────────────┤ │ Steel: 7850 │ │ │ Alum: 2700 │ │ │ SS: 8000 │ │ └──────┬──────┘ │ │ │ ▼ ▼ ┌─────────────────────────────┐ │ Weight = Volume × Density │ └─────────────────────────────┘

Material Database

MaterialDensity (kg/m³)
Mild Steel7,850
Stainless Steel8,000
Aluminum2,700
Cast Iron7,200
CustomUser-specified
  • ○ Implement volume query via sld ask bod vol
  • ○ Create material database (JSON or VDM)
  • ○ Support custom material density input
  • ○ Handle assemblies (sum of individual bodies)
  • ○ Output weight in kg and lbs

Center of Gravity (CoG)

CoG Output

CENTER OF GRAVITY ┌───────────────────────────┐ │ PART │ │ │ │ ⊕ CoG │ ◀── X, Y, Z coordinates │ (x, y, z) │ │ │ └───────────────────────────┘ USE CASES: - Verify fixture balanced on positioner axis - Calculate moment arms for clamp force - Determine forklift pickup points - Check fixture won't tip during rotation
  • ○ Query CoG via sld ask bod cog or Parasolid API
  • ○ Compute combined CoG for multi-body assemblies
  • ○ Visualize CoG marker in 3D view
  • ○ Compare CoG to positioner rotation axis
  • ○ Generate stability report (tip-over risk)

Combined Fixture + Part Analysis

Total weight including fixture components for crane/positioner capacity verification.

  • ○ Sum all blade weights (flat pattern area × thickness × density)
  • ○ Add baseplate weight
  • ○ Add estimated hardware weight (bolts, clamps)
  • ○ Compare total to positioner max load
  • ○ Generate load capacity warning if exceeded

📦 Deliverables

fxCalcWeight.ovm - part weight calculation

fxCalcCoG.ovm - center of gravity calculation

fxFixtureWeightReport.ovm - combined weight analysis

material_database.json - material density lookup