Gears and transmission
Drone Core Body Assembly
- Bounding box
- 180.0 × 200.0 × 3.0 mm
- Engine
- Precision B-rep
- Parameters
- 64
- Published
- August 7, 2026
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The prompt
PROCESS RULES (hard): CF plate in exactly 2.0 and 3.0 mm. Every CF part is a 2D extrusion of one closed profile - no pockets, steps, chamfers, or 3D contour in composite. Min internal radius 1.6 mm, min feature width 3.0 mm, min edge-to-hole 2x dia. CF tube in exactly two sizes: 25.0x23.0 mm arms, 20.0x18.0 mm gear and masts, square cuts to length only, no notches or miters. Aluminum cuffs and machined datum bars allowed. Fasteners M3 structure, M4 payload/gear, socket cap only, 2.5 mm hex where possible, threads land in aluminum or a nut plate never in laminate, 3x-dia washer under any head on CF. Tab-and-slot self-jigging plates, 0.05 mm slip fit. Buildable on a 3-axis router and a tube saw. No molds, no 5-axis, no welding, no castings. AIRCRAFT: autonomous wildfire-mapping quad X. 780 mm motor-to-motor diagonal, 551 mm adjacent spacing, 18x6.1 in folding props, 94 mm disc gap. Core body 200x180 mm, two-plate sandwich, 60 mm plate-to-plate. AUW 7.30 kg, MTOW 8.50 kg. Gear track 500x480 mm, 260 mm belly clearance. Payload envelope 170x120x130 mm, 1.5 kg max. VALIDATE: every gen_step_part exits 0, cadref inspect reports watertight solids with no self-intersections, assembly loads in CAD Viewer, return the link. Report mass and CG. Build only the core body assembly. Plates, ribs, avionics bay, battery tray, power, cooling. Leave four arm-cuff mounting interfaces as flat mating faces with a bolt pattern; the cuffs come later. Report plate profile count and mass.
Parameters
| Name | Value | Range |
|---|---|---|
| Top plate length (X) | 180 mm | 150 – 300 |
| Top plate width (Y) | 200 mm | 150 – 300 |
| Top plate thickness | 3 mm | 2 – 10 |
| Top plate Z center | 30 mm | 20 – 40 |
| Lightening cutout rows | 2 | 1 – 4 |
| Lightening cutout columns | 3 | 1 – 4 |
| Cutout width | 30 mm | 10 – 50 |
| Cutout height | 40 mm | 10 – 50 |
| Cutout margin | 20 mm | 10 – 40 |
| Fan hole diameter | 80 mm | 40 – 100 |
| Bottom plate length (X) | 180 mm | 150 – 300 |
| Bottom plate width (Y) | 200 mm | 150 – 300 |
| Bottom plate thickness | 3 mm | 2 – 10 |
| Bottom plate Z center | -30 mm | -40 – -20 |
| Center access cutout width (Y) | 150 mm | 100 – 180 |
| Center access cutout length (X) | 100 mm | 80 – 160 |
| Cuff cutout side length | 55 mm | 40 – 70 |
| Side rib length (X) | 180 mm | 150 – 200 |
| Side rib height | 54 mm | 40 – 70 |
| Side rib thickness | 2 mm | 1.5 – 4 |
| Lightening hole diameter | 15 mm | 8 – 25 |
| Number of holes | 3 | 1 – 5 |
| Hole spacing | 45 mm | 30 – 70 |
| Front/rear rib length (Y) | 200 mm | 150 – 250 |
| Front/rear rib height | 54 mm | 40 – 70 |
| Front/rear rib thickness | 2 mm | 1.5 – 4 |
| Front rib hole diameter | 20 mm | 10 – 30 |
| Front rib hole count | 2 | 1 – 4 |
| Front rib hole spacing | 70 mm | 50 – 100 |
| Battery tray length (X) | 170 mm | 150 – 200 |
| Battery tray width (Y) | 120 mm | 100 – 150 |
| Battery tray thickness | 3 mm | 2 – 6 |
| Standoff height | 20 mm | 15 – 30 |
| Rail width | 10 mm | 5 – 15 |
| Rail height | 2 mm | 1 – 4 |
| Rail edge distance | 5 mm | 2 – 10 |
| Avionics bay length (X) | 120 mm | 80 – 150 |
| Avionics bay width (Y) | 80 mm | 60 – 100 |
| Avionics bay height | 32 mm | 25 – 50 |
| Wall thickness | 1.5 mm | 1 – 3 |
| Bracket length (X) | 90 mm | 70 – 120 |
| Bracket width (Y) | 70 mm | 50 – 100 |
| Bracket thickness | 6 mm | 4 – 10 |
| Standoff height | 25 mm | 15 – 35 |
| PCB thickness | 2 mm | 1 – 3 |
| Bracket X offset (aft) | -60 mm | -90 – 0 |
| Bracket Y offset (starboard) | 60 mm | 0 – 90 |
| Fan duct side length | 90 mm | 60 – 110 |
| Fan duct height | 25 mm | 15 – 35 |
| Duct internal diameter | 80 mm | 60 – 100 |
| Duct X position (front) | 90 mm | 70 – 100 |
| Duct Y position (center) | 0 mm | -50 – 50 |
| Cuff plate length | 50 mm | 30 – 60 |
| Cuff plate width | 40 mm | 30 – 50 |
| Cuff plate thickness | 8 mm | 5 – 12 |
| M4 clearance hole diameter | 4.3 mm | 4 – 5 |
| Dowel pin hole diameter | 3 mm | 2 – 4 |
| Hole offset from edge | 10 mm | 5 – 15 |
| Screw shank diameter (M3) | 3 mm | 2 – 4 |
| Screw head diameter | 5.5 mm | 4 – 7 |
| Screw head height | 2.5 mm | 1 – 3 |
| Screw length | 8 mm | 5 – 12 |
| Washer outer diameter | 7 mm | 5 – 9 |
| Washer thickness | 0.5 mm | 0.2 – 1 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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