Gears and transmission
Small Spur Gear with Integral Hub
- Bounding box
- 10.5 × 10.5 × 12.0 mm
- Engine
- Precision B-rep
- Parameters
- 9
- Published
- September 29, 2026
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The prompt
Create a detailed 3D CAD model of a small plastic spur gear with an integral cylindrical hub. Units: mm. Gear dimensions Number of teeth: 12, equally spaced every 30°. Tooth-tip outside diameter: 10.50 mm. Tooth-root diameter: 7.85 mm. Pitch diameter: 9.00 mm. Module: 0.75 mm. Tooth thickness: approximately 1.20 mm. Toothed face width: 7.53 mm. Teeth must be straight, not helical. Hub and bore Hub projects 4.47 mm beyond the toothed section. Total axial length: 12.00 mm. Central through-bore: Ø5.00 mm. Hub outside diameter: provisionally Ø9.00 mm, assuming 2 mm radial wall thickness. Hub, gear body, and teeth must be one solid, concentric part. Pin holes Two opposed radial holes, each Ø2.25 mm, through opposite sides of the hub. Hole axes perpendicular to the main gear axis. Hole centers approximately 0.40 mm below the end of the toothed section. No axial pin holes. Use an involute tooth profile if possible. Pressure angle is unverified; use 20° only as a provisional assumption. Preserve all specified dimensions and report conflicts instead of silently changing them. Generate an editable 3D solid and, if supported, export STEP and STL files. Also provide front, side, and end views
Parameters
| Name | Value | Range |
|---|---|---|
| Module | 0.75 mm | 0.3 – 3 |
| Number of Teeth | 12 mm | 6 – 40 |
| Pressure Angle | 20 deg | 10 – 30 |
| Toothed Face Width | 7.53 mm | 2 – 20 |
| Hub Projection | 4.47 mm | 1 – 20 |
| Bore Diameter | 5 mm | 1 – 10 |
| Hub Outside Diameter | 9 mm | 5.1 – 15 |
| Pin Hole Diameter | 2.25 mm | 0.5 – 4 |
| Pin Hole Center Offset from Toothed Section | 0.4 mm | 0 – 2 |
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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