Gears and transmission
2-Stage Compound Spur Gearbox
- Bounding box
- 80.0 × 68.0 × 62.0 mm
- Engine
- Precision B-rep
- Parameters
- 40
- Published
- November 12, 2026
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The prompt
Design a 3D-printable 2-stage compound spur gear reduction gearbox (19.36:1 total ratio, Module 1.0, 20° pressure angle) for an RC ornithopter, driven by a top-mounted 1000 KV BLDC motor. The gear train consists of a 10T motor pinion meshing with a 44T/10T intermediate compound gear, which drives a final 44T output gear mounted on 11 mm OD ball bearings with dual output crank arms for wing flapping.
Parameters
| Name | Value | Range |
|---|---|---|
| Module | 1 mm | 0.5 – 2 |
| Motor Pinion Teeth | 10 teeth | 8 – 20 |
| Intermediate Large Teeth | 44 teeth | 20 – 60 |
| Intermediate Small Teeth | 10 teeth | 8 – 20 |
| Final Gear Teeth | 44 teeth | 20 – 60 |
| Pinion Face Width | 6 mm | 3 – 12 |
| Compound Section Width | 6 mm | 3 – 10 |
| Final Gear Width | 6 mm | 3 – 12 |
| Pinion Bore | 3 mm | 2 – 6 |
| Gear Bore | 5 mm | 3 – 8 |
| Idler X Position | -13.5 mm | -30 – 0 |
| Idler Y Position | -5 mm | -15 – 5 |
| Gear Mesh Bottom Z | -4 mm | -8 – 0 |
| Housing X Length | 80 mm | 50 – 120 |
| Housing Y Length | 64 mm | 45 – 100 |
| Housing Height | 22 mm | 16 – 40 |
| Wall Thickness | 3 mm | 2 – 6 |
| Window Length | 30 mm | 10 – 50 |
| Window Height | 12 mm | 4 – 20 |
| Motor Mount Diameter | 20 mm | 12 – 35 |
| Motor Mount Height | 3 mm | 1 – 8 |
| Motor Shaft Hole Diameter | 8 mm | 4 – 14 |
| Bearing Boss OD | 17 mm | 12 – 24 |
| Motor Diameter | 28 mm | 18 – 45 |
| Motor Length | 30 mm | 18 – 60 |
| Motor Shaft Diameter | 3 mm | 2 – 6 |
| Motor Shaft Length | 12 mm | 5 – 30 |
| Idler Shaft Diameter | 5 mm | 3 – 8 |
| Idler Shaft Length | 24 mm | 12 – 40 |
| Bearing OD | 11 mm | 8 – 20 |
| Bearing ID | 5 mm | 3 – 10 |
| Bearing Width | 5 mm | 3 – 10 |
| Output Shaft Diameter | 5 mm | 3 – 8 |
| Output Shaft Length | 40 mm | 25 – 70 |
| Output Shaft Bottom Z | -18 mm | -30 – 0 |
| Crank Arm Length | 20 mm | 10 – 40 |
| Crank Arm Width | 6 mm | 3 – 12 |
| Crank Arm Thickness | 4 mm | 2 – 8 |
| Crank Hub Diameter | 10 mm | 6 – 16 |
| Crank Hub Height | 6 mm | 3 – 12 |
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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