DWG 4WT-001-REV2
SCALE 1:10
UBC DESIGN LEAGUE
48HR DESIGNATHON
DATE 2023
UBC Design League · Designathon · 2024
4WARDTHINKER
Designed in a 48-hour sprint: an affordable, mass-manufacturable meal-serving robot rated to 60 kg load capacity — verified by Fusion360 FEA — built for real-world deployment in cafeterias, senior homes, and hospitals.
The goal: strong enough for real loads, safe around people, cheap enough that scaling to dozens of units stays realistic. Full concept, CAD, simulation, and electronics layout in two days.
Fusion 360FEA StressCircuit DesignUltrasonicModular Build
GitHub source ↗
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Modular chassis2
Tray assembly3
Sensor ringPRIMARY ASSEMBLY — 3D VIEW4WT-ASM-001
SECTION A — EXPLODED ASSEMBLY
Exploded Assembly
Every component, laid bare.
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Structural rails2
Battery compartment3
Tray arm assemblies4
Lid-lock mechanism5
Motor enclosure6
Cable routingSECTION B — SPECIFICATIONS
Bill of Specifications
The numbers.
PARAMETERVALUENOTES
Total assembly mass32.67 kgPLA thermoplastic
Rated load capacity60 kgVerified by FEA simulation
Tray configuration4 × 15 kgStacked, independently mounted
Tray footprint30 × 40 cmParametric, resizable
Collision sensors6 sensorsUltrasonic, 360° coverage
Motor enclosureDedicated housingIsolated vibration paths
Build timeline48 hoursConcept → CAD → analysis
Target deploymentCafeterias · hospitalsSenior care facilities
SECTION C — ORTHOGRAPHIC VIEWS
ORTHOGRAPHIC PROJECTION — ALL VIEWS4WT-ORTH-001
Mechanical Design Notes
The assembly balances stability with portability at 32.67 kg. PLA was chosen for its low carbon footprint and the stiffness needed within a 48-hour development window.
FEA simulation — tray bending and torsion under full load
Motor enclosure with isolated vibration paths
Cable routing channels for fast assembly and maintenance
Battery compartment with passive cooling gaps
Tray arms designed for easy lid-mechanism replacement
SECTION D — TEAM
Collaborators
