# Ngoni — Drawing Brief

**Instrument:** Ngoni (Kamele N'goni) — Kamele 10 primary  
**Drawing standard:** Heifer Zephyr technical drawing convention (see references/drawing-and-visualization.md)  
**Units:** Inches (primary); mm in parentheses  
**Scale:** 1:4 for full assembly; 1:1 for bridge and string detail  
**Date:** 2026-05-08

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## Required Drawings

### DWG-NGO-001 — Full Assembly (Side View)

**View:** Right-side elevation  
**Scale:** 1:4  
**Dimensions to call out:**
- Overall length neck tip to bowl base: ___ in (TBD — bowl depth + neck protrusion + neck outside bowl)
- Bowl outer diameter: 12.6 in (320 mm)
- Bowl depth: 6.5 in (165 mm)
- Neck length (total): 30.0 in (762 mm)
- Shortest vibrating string: 6.5 in (165 mm)
- Longest vibrating string: 22.0 in (559 mm)
- Bridge height above skin: 0.625 in (16 mm) TBD
- Neck-entry hole position: center of head-rim ring

**Section view:** A-A through bowl centerline (shows wall thickness, neck-through detail, base plug)

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### DWG-NGO-002 — Bowl Plan View (Top / Head Face)

**View:** Top-down onto goatskin head  
**Scale:** 1:3  
**Dimensions:**
- Bowl outer rim: 12.6 in Ø
- Neck position: center
- Bridge footprint on skin: 4.0 × 2.0 in (centered on neck axis, offset toward tail 1.5 in from neck)
- String spread at bridge: 10 notches at 8 mm spacing

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### DWG-NGO-003 — Ring Segment Detail

**View:** Single segment (plan + elevation)  
**Scale:** 1:1  
**Dimensions (shown for Ring 8, outer Ø 12.0 in — largest typical ring):**
- Segment outer arc length: 3.77 in
- Segment height: 0.625 in
- Miter angle: 18° each end
- Wall target: 0.375 in + turning allowance (cut at 0.75 in; turn down to 0.375 in)
- Note: profile is for illustration; final wall set on lathe

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### DWG-NGO-004 — Neck Detail

**View:** Side elevation + cross-section at midpoint  
**Scale:** 1:2  
**Dimensions:**
- Total length: 30.0 in
- Profile: 1.0 in Ø round (D-section optional)
- Bowl-entry zone: last 3.0 in (snug fit to 1.25 in bowl hole)
- Nut position: 1.0 in from headstock end
- Bridge position: 1.5 in from bowl rim (on skin)

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### DWG-NGO-005 — Bridge Detail

**View:** Plan + side elevation + section through notch  
**Scale:** 2:1 (enlarged)  
**Dimensions:**
- Overall: 4.0 in × 2.0 in × 0.75 in (L×W×H)
- Foot radius: 0 (flat bottom)
- Crown height: 1/16 in at center
- Notch count: 10
- Notch spacing: 8 mm (0.315 in) center-to-center
- Notch depth: 1 mm; notch width: 1 mm
- Material callout: Hard Maple

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### DWG-NGO-006 — String Layout (schematic)

**View:** Plan (top-down) showing all 10 strings from nut to anchor rod  
**Scale:** 1:4  
**Shows:**
- Vibrating length markers for each string (6.5–22.0 in)
- Note labels (D5 through F3)
- Bridge position
- Nut / konso position
- Anchor rod position at tail

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## Title Block (all drawings)

| Field | Value |
|---|---|
| Project | Ngoni (Kamele N'goni) |
| Designer | Tony Koop |
| Organization | Heifer Zephyr Instrument Works |
| Drawing number | DWG-NGO-00x |
| Revision | A (initial release) |
| Date | 2026-05-08 |
| Units | Inches (mm) |
| Scale | Per drawing |

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## Notes for Drafter / CAD

- All dimensions are nominal; tolerances:
  - Bowl diameter: ± 1/8 in (lathe work)
  - String lengths: ± 1/16 in
  - Bridge notch spacing: ± 0.5 mm
- Skin head and konso tuning rings are shown in elevation only; they are not dimensioned (field-fitted)
- DWG-NGO-001 section A-A is the critical drawing — confirm neck-through geometry and wall thickness before finalizing
- SVG auto-generated drawing is at drawings/ngoni-assembly.svg (generated)