ARCHITECTURE CHANGE: batteries no longer sit flat on the base plate.
They mount VERTICALLY on a central mast via a height-adjustable carousel.
CG is tuned by sliding the carousel up/down the stem.
Part A — prototype_baseplate.scad (Rev C):
- PLATE_DEPTH: 210mm → 130mm (no battery footprint constraint)
- Removed all battery tray geometry (holes, strap slots, expansion mounts)
- Added central stem socket: Ø38.6mm bore + 4x M5 flange bolt holes on Ø66mm BC
- Added stem_flange() module: laser-cut ring (qty 2, one each side of plate)
- Wiring pass-through slots flanking stem centre
- FC mount relocated to FC_X_OFFSET = -40mm (front of plate, clear of stem)
- New RENDER="stem_flange_2d" DXF export option
Part B — stem_battery_clamp.scad (new):
- Collar: two 3D-printed D-shaped halves, split at Y=0
- Ø38.6mm bore (1.5" EMT / 6061-T6 tube)
- 4x M6 clamping bolts + hex nut pockets
- 1x M6 set screw per half for height/rotation lock
- Arm attachment pads with M4 through-holes + nut pockets
- Arms: flat bars, laser-cut or printed, ARM_REACH=55mm
- Battery cradles: U-channel, open top, Velcro strap slots at 30% + 65% height
- BATT_COUNT param: 2 (180°), 3 (120°), or 4 (90°) radial batteries
- ARM_START_ANGLE chosen per BATT_COUNT to keep all arms clear of Y=0 split
- Battery ghosts in assembly for visualisation
- Full RENDER control: assembly / collar_half / arm / arm_2d / cradle
- Assembly sequence + CG tuning notes in file footer
BOM.md → Rev C:
- Part A table updated (5 laser-cut parts + stem tube)
- Part B table added (collar halves, arms, cradles, fasteners)
- Battery section: flat-deck layout replaced with vertical stem guide
- Fastener table updated to match new architecture
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
sl-mechanical
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