feat: SaltyRover chassis Rev 2 — 4-wheel rover with spring suspension (#109)
New chassis design files for the SaltyRover rough-terrain variant:
• saltyrover_chassis_r2.scad — Deck plate (500×480×6mm Al, laser-cut DXF),
4× M3-adjustable pivot brackets, 4× CSI corner camera mounts (45° outward,
20° down), D435i front bracket (8° tilt), stem collar. All RENDER modes
for STL and DXF export included.
• rover_spring_arm.scad — Trailing-arm spring suspension (×4). Pivot on M8
bolt; captured 14mm OD compression spring (50mm free, ~5 N/mm); open-end
axle dropout slot with retainer cap. Provides 25mm bump + 15mm droop travel.
Bearing-seat recess for caliper-verified 37.8mm collar OD.
• rover_electronics_bay.scad — PETG electronics bay (240×200×80mm internal).
FC standoffs 30.5×30.5mm M3 and Jetson Orin 58×49mm M3 — shared SaltyLab
swappable pattern. Ventilation slots all 4 walls + lid. Lid integrates
100mm RPLIDAR A1M8 tower (58mm BC, matched to rplidar_mount.scad).
Split-print halves for 220mm beds included.
• rover_chassis_r2_BOM.md — Full BOM, mass estimate (frame ~2.15kg; reduce
to <2kg by setting DECK_T=5), assembly sequence, critical dimensions.
Sensor positions: RPLIDAR top-centre on bay lid, D435i front, 4× IMX219 at
deck corners. Shares 30.5mm FC + 58mm Jetson + Ø25mm stem patterns with
SaltyLab for swappable electronics.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
sl-mechanical
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