Gears and transmission
Ring Gear 131 (Internal)
- Bounding box
- 54.0 × 54.0 × 12.0 mm
- Engine
- Precision B-rep
- Parameters
- 6
- Published
- September 20, 2026
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The prompt
1. New Part, MMGS units. Front Plane fi Sketch fi draw two concentric circles on the origin: Smart Dimension the outer to 54 mm diameter and the inner (root) circle to 48 mm diameter. 2. Exit sketch. Extruded Boss/Base fi Blind fi depth 12 mm (matching the dynamo stack length so the whole gear stage lines up later) fi confirm. This annular ring is the gear blank. 3. Click the front face fi Sketch fi draw one small tooth-shaped notch on the inner (48 mm) edge, roughly 1.5 mm deep × 3 mm wide, using the Line tool. 4. Exit sketch fi Extruded Cut fi Through All fi confirm. This cuts one internal tooth gap. 5. Features fi Circular Pattern fi select the cut feature you just made in the FeatureManager tree fi click inside the “Pattern Axis” field fi click the ring's cylindrical face (SolidWorks uses its central axis automatically) fi set Number of Instances to 36, Total Angle 360° fi confirm. All 36 teeth appear in one step. 6. Save As fi name it Ring_Gear_131
Parameters
| Name | Value | Range |
|---|---|---|
| Outer Diameter | 54 mm | 20 – 200 |
| Root / Inner Circle Diameter | 48 mm | 10 – 190 |
| Face Width (Stack Length) | 12 mm | 1 – 100 |
| Number of Teeth | 36 teeth | 6 – 200 |
| Tooth Gap Depth | 1.5 mm | 0.2 – 10 |
| Tooth Gap Width | 3 mm | 0.5 – 20 |
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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