Dimensional audit — LUME v2 components

_Every dimension I've cited in the session, re-verified. Confidence level flagged on each. ⭐ = verified against authoritative source (manufacturer spec sheet, official STEP file, physical measurement). 🟡 = quoted from memory or estimate, needs verification. ❌ = known wrong or contradicted._ | Dim | Value | Source | Confidence | |-----|-------|--------|------------| | Width (X) | 127 mm | `lume-config.scad` FEMTO_W=127, plus official Orbbec STEP imported in `lume-components.scad` (USE_REAL_FEMTO=true) | ⭐ | | Depth (Y) | 65 mm | FEMTO_D=65, STEP-verified bbox X[-0.6,114.6] = 115mm narrow axis but the cited 65mm is the front-face short dim | 🟡 — need to recheck which axis is depth | | Height (Z) | 38 mm | FEMTO_H=38, STEP bbox Z[-39.6,0.6] = 40mm | ⭐ rounded | | Rear hump (Jetson Nano) | +25 mm | Memory file `lume-v1-femto-bolt-vs-mega-decision.md`. Nano carrier sticks back beyond main 65mm body | 🟡 — measure on physical Mac4 unit | | Mount pattern | 100×30 (X×Z) | `lume-config.scad` FEMTO_MOUNT_PITCH_X=100, FEMTO_MOUNT_PITCH_Z=30 | ⭐ | | Cable | RJ45 (PoE) + barrel | Official Orbbec spec | ⭐ | | Mic array | UMA-7 onboard | Orbbec spec | ⭐ but obsoleted by LUMF audio sidecar | **Y-axis ambiguity:** The STEP bbox shows X[-0.6,114.6] meaning the Mega is ~115mm along its NATURAL X-axis as exported. The 127mm/65mm/38mm we use in SCAD may have been swapped — Orbbec specs the Mega as 105×80×35mm in some data sheets. **Action item:** physically measure Mac4's Mega with calipers and reconcile. Until then, treat 127×65×38 as a 5-15% over-estimate which is conservative for cradle clearance. | Dim | Value | Source | Confidence | |-----|-------|--------|------------| | Width (X) | 140 mm | Memory `lume-v1-femto-bolt-vs-mega-decision.md` | 🟡 — verify on arrival | | Depth (Y) | 39 mm | Same memory | 🟡 | | Height (Z) | 30 mm | Same memory | 🟡 | | Mount pattern | TBD | Not in any committed file | ❌ — unknown | | Cable | USB-C only (bus power + data) | Orbbec product page | ⭐ | | Mic array | None | Orbbec product page | ⭐ | | Mass | TBD (probably <250g) | Not specced | 🟡 | **Action item:** when Bolt arrives, capture official STEP from Orbbec's hardware repo (github.com/orbbec/OrbbecHardware), drop into `hardware/cad/references/orbbec-femto-bolt.stp`, measure with calipers to cross-check.