Gears and transmission
12T Module 0.75 Spur Gear with Hub
- Bounding box
- 10.5 × 10.5 × 12.0 mm
- Engine
- Precision B-rep
- Parameters
- 10
- Published
- October 14, 2026
Download
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The prompt
Create a precision 12-tooth spur gear with the following specifications: Module: 0.75 mm Pressure angle: 20° Outside diameter: Ø10.50 mm Root diameter: Ø7.10 mm (updated from Ø7.30 mm) Pitch diameter: Ø9.00 mm Gear face width: 7.53 mm Hub outside diameter: Ø9.00 mm Hub extension: 4.47 mm Overall length: 12.00 mm Central axial through-bore: Ø5.00 mm One radial through-hole: Ø2.25 mm, perpendicular to the main axis, creating two opposite openings aligned directly beneath two opposite tooth valleys. The nearest edge of the radial hole must be exactly 0.10 mm from the gear/hub shoulder (hole center Z = 8.755 mm, assuming gear starts at Z = 0). Use straight involute spur teeth with 12 equally spaced teeth and 12 valleys. Preserve the tooth-tip diameter, pitch diameter, tooth thickness at the pitch circle, and all other dimensions. Only reduce the root diameter to Ø7.10 mm, extending the tooth-root transitions accordingly. Create one connected, watertight solid suitable for precision 3D printing. Export in STEP format using millimeters. Do not rescale the model.
Parameters
| Name | Value | Range |
|---|---|---|
| Module | 0.75 mm | 0.2 – 3 |
| Number of Teeth | 12 teeth | 6 – 40 |
| Pressure Angle | 20 deg | 14.5 – 25 |
| Gear Face Width | 7.53 mm | 1 – 30 |
| Central Axial Bore | 5 mm | 0.5 – 30 |
| Hub Outside Diameter | 9 mm | 4 – 60 |
| Hub Extension | 4.47 mm | 1 – 40 |
| Radial Cross-Hole Dia | 2.25 mm | 0.5 – 8 |
| Cross-Hole Center Height (Z) | 8.76 mm | 1 – 40 |
| Cross-Hole Clocking | 15 deg | 0 – 360 |
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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