Gears and transmission
12T Module 0.75 Spur Gear w/ Transverse Cross-Hole
- Bounding box
- 10.3 × 10.3 × 12.0 mm
- Engine
- Precision B-rep
- Parameters
- 10
- Published
- October 14, 2026
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The prompt
Use the attached previously verified STEP gear with the exact Ø7.100 mm root diameter. Preserve the entire original tooth geometry without rebuilding or regenerating it. Modify only the transverse through-hole: - Diameter: Ø2.300 mm - Center: Z = 8.780 mm - Axis: perpendicular to the gear axis, aligned beneath opposite tooth valleys - Nominal clearance from gear/hub shoulder: 0.100 mm Preserve all other features exactly, including the Ø7.100 mm root diameter, Ø10.500 mm outside diameter, Ø5.000 mm axial bore, Ø9.000 mm hub diameter, 7.530 mm gear face width, and 12.000 mm overall length. Verify the physical root diameter after the modification, not just the design parameter. Export one valid STEP solid in millimeters.
Parameters
| Name | Value | Range |
|---|---|---|
| Module | 0.75 mm | 0.3 – 2 |
| Number of Teeth | 12 count | 6 – 60 |
| Gear Face Width | 7.53 mm | 2 – 30 |
| Reference Root Diameter | 7.1 mm | 3 – 60 |
| Hub Diameter | 9 mm | 5 – 60 |
| Hub Extension | 4.47 mm | 0.5 – 40 |
| Axial Bore Diameter | 5 mm | 1 – 20 |
| Cross-Hole Diameter | 2.3 mm | 0.5 – 6 |
| Cross-Hole Centre Z | 8.78 mm | 3 – 30 |
| Shoulder Clearance | 0.1 mm | 0.02 – 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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