CAD Reviews

Engineering reviews of the fleet's critical mechanisms. Each review pairs SVG sheets with a markdown summary explaining design decisions, fabrication, and R24 compliance.

Polycarb Tube R24 Audit

SKIMMER 2822A · 5 sheets · revised 2026-05-11

R24 compliance correction for the polycarb tube. Tube dimensions updated to OD 2.55″ / ID 2.43″ / wall 0.060″. Includes two-piece clamshell funnel cap (R24-legal alternative to the original single-piece 4.5″ funnel). Covers fabrication process, OnShape walkthrough, TinkerCAD walkthrough, and Bambu P2S 3D print prototype settings.

1Developed length audit · 2Fabrication compliance · 3Corrected tube CAD · 4Funnel flat pattern · 5Funnel assembly

Open R24 audit →

Skimmer Path A Roller

SKIMMER 2822A · 5 sheets · 2026-05-11

Front compression-wheel roller for Path A floor pickup. 3× 4″ flex wheels on shared shaft, 12″ active width, axle at 1.7″ off tile. Covers wheel selection rationale, compression geometry, width allocation across the 18″ chassis, and roller-to-tube transfer geometry.

1Wheel selection · 2Compression geometry · 3Width front view · 4Roller-to-tube transfer · 5BOM + fabrication

Open roller CAD →

Spoonbill Rotating Claw

SPOONBILL 2822D · 5 sheets · 2026-05-11

Hex face indexing for pin orientation control. 5.5W rotation motor on lift carriage drives a 1:3 reduction to the claw turret, giving 6 preset positions at 60° intervals. Covers hex face math, gear ratio rationale, wire routing options (slip ring vs wire wrap), and tactical use cases.

1Hex face indexing · 2Rotation mechanism · 3Gear ratio + encoder math · 4Wire routing · 5Three positions demo

Open rotating claw CAD →

Polycarb Tube CAD (Superseded)

SKIMMER 2822A · 7 sheets · superseded 2026-05-11

Earlier polycarb tube review kept for iteration history. Tube ID recommendations in this review are outdated — see the R24 audit above for current dimensions. This review's analysis of element cross-sections, cinch mechanism geometry, and full assembly still applies; only the specific tube ID values changed.

1Element cross-sections · 2Tube ID sizing · 3Tube length · 4Mouth options · 5Cinch · 6Mount · 7Assembly

Open (for context) →

How to use the CAD packages

Each package contains:

Engineering summary (markdown) — critical findings, dimensions, fabrication steps, action items
SVG sheets — CAD-quality diagrams sized at 1″ = 12px or 1″ = 24px, with dimensions traced to the game manual's Appendix A figures

For the engineering notebook (EN4 compliance), the team rewrites the package's design rationale in their own voice. The CAD diagrams can be referenced and traced as starting points; the notebook narrative reflects the team's own engineering thinking.

Cross-references

The Skimmer roller CAD complements the polycarb tube R24 audit — together they cover the complete Path A pin pickup architecture
The bench-test protocols reference these CAD reviews for the target geometry being tested
Code references (chain bar state machine, SG2 lockout, hex face indexing) are in the spartan-library