Gears and transmission
Precision Spur Gear with Hub and Cross-Hole
- Bounding box
- 10.5 × 10.5 × 12.0 mm
- Engine
- Precision B-rep
- Parameters
- 11
- Published
- October 14, 2026
Download
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The prompt
Modify the attached STEP gear. The actual tooth-root diameter is approximately Ø7.116 mm, but it must be exactly Ø7.100 mm. Correct the physical valley geometry, not just the parameter. Preserve all other geometry, including the 12 teeth, Ø10.50 mm outside diameter, Ø9 mm hub, Ø5 mm bore, Ø2.25 mm transverse hole, 0.10 mm shoulder-to-hole-edge clearance, and 12 mm overall length. Keep the hole openings aligned beneath opposite valleys. Export one valid solid as STEP in millimeters.
Parameters
| Name | Value | Range |
|---|---|---|
| Module | 0.75 mm | 0.3 – 2 |
| Number of Teeth | 12 | 6 – 60 |
| Pressure Angle | 20 deg | 14 – 30 |
| Face Width | 7.53 mm | 2 – 20 |
| Root Diameter | 7.1 mm | 6.5 – 8.5 |
| Central Bore Diameter | 5 mm | 3 – 6 |
| Hub Outside Diameter | 9 mm | 6 – 12 |
| Hub Extension Length | 4.47 mm | 2 – 10 |
| Radial Hole Diameter | 2.25 mm | 1 – 4 |
| Radial Hole Center Z | 8.76 mm | 7.65 – 10.8 |
| Radial Hole Angle | 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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