Gears and transmission
Spur Gear 12T Mod 0.75 with Transverse Ø2.30 Hole
- Bounding box
- 10.3 × 10.3 × 12.0 mm
- Engine
- Precision B-rep
- Parameters
- 8
- Published
- October 14, 2026
Download
Free to download and use. See the terms.
The prompt
Modify the attached STEP gear model. Change ONLY the transverse (radial) through-hole diameter from Ø2.33 mm to Ø2.30 mm. Maintain the following requirements: Final transverse hole diameter: Ø2.30 mm. Hole axis perpendicular to the main gear axis. Hole passes through the central Ø5.00 mm bore. Hole aligned beneath two opposite tooth valleys. Hole center at Z = 8.780 mm, measured from the gear's front face. Maintain exactly 0.10 mm nominal clearance between the nearest edge of the transverse hole and the gear/hub shoulder at Z = 7.530 mm. Preserve all other dimensions: Number of teeth: 12. Module: 0.75 mm. Pressure angle: 20°. Root diameter: Ø7.10 mm. Outside diameter: Ø10.50 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. Do not modify the tooth geometry, hub, bore, or any other feature. Export one valid watertight STEP solid in millimeters.
Parameters
| Name | Value | Range |
|---|---|---|
| Module | 0.75 mm | 0.3 – 3 |
| Number of Teeth | 12 count | 6 – 60 |
| Gear Face Width | 7.53 mm | 2 – 30 |
| Hub Outside Diameter | 9 mm | 4 – 40 |
| Hub Extension | 4.47 mm | 0 – 40 |
| Central Axial Bore | 5 mm | 1 – 20 |
| Transverse Hole Diameter | 2.3 mm | 0.5 – 8 |
| Transverse Hole Centre Z (from gear front face) | 8.78 mm | 0 – 30 |
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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