Gears and transmission
Two-Speed Sequential Gearbox (Concept Model - Exploded)
- Bounding box
- 1541.0 × 75 × 52 mm
- Engine
- 3D Printing B-rep
- Parameters
- 25
- Published
- November 12, 2026
Download
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The prompt
Generate a complete, syntactically valid OpenSCAD script for a 3D-printable conceptual model of a miniature two-speed sequential gearbox inspired by Formula 1 transmissions. IMPORTANT OUTPUT REQUIREMENTS: - Output exactly ONE fenced code block labelled `openscad`. - Include the entire OpenSCAD script inside that block. - Do not include explanations or text outside the code block. - Use standard OpenSCAD syntax only. - Make the model renderable using F6. DESIGN SPECIFICATION: Create a compact gearbox approximately 110 mm long, 75 mm wide and 40 mm high. Include the following components: 1. GEARBOX HOUSING - Rectangular housing with rounded corners. - Removable-looking upper cover. - Visible internal components. - Mounting holes in the base. - Open or transparent top to show the mechanism. 2. INPUT AND OUTPUT SHAFTS - Two parallel horizontal shafts. - 8 mm diameter. - Approximately 37.5 mm apart. - Shafts should extend outside the housing. 3. FOUR SPUR GEARS - Module 1.5 mm. - Two 20-tooth gears. - Two 30-tooth gears. - 10 mm gear face width. - Approximate 37.5 mm centre distance. - Generate realistic involute-style gear teeth if practical. 4. SEQUENTIAL SELECTOR MECHANISM - Central sliding selector component. - Selector fork. - Sliding dog clutch. - Three-position selector drum. - Spring-loaded indexing detent. 5. EXTERNAL CONTROLS - Manual hand crank on input shaft. - Sequential gear selection lever. - Output shaft. 6. PRESENTATION - Use separate colours for the housing, shafts, gears and selector components. - Arrange components in mechanically understandable positions. - Include an exploded-view option controlled by a variable at the top of the script. - Make components separate and printable where possible. Prioritise a clear mechanical demonstration and visualisation. This is a conceptual prototype, not a validated functional gearbox.
Parameters
| Name | Value | Range |
|---|---|---|
| Spacing between exploded parts | 130 mm | 90 – 300 |
| Housing length | 110 mm | 60 – 200 |
| Housing width | 75 mm | 40 – 150 |
| Housing base height | 30 mm | 20 – 80 |
| Wall thickness | 3 mm | 1.5 – 8 |
| Base floor thickness | 4 mm | 2 – 12 |
| Corner radius | 6 mm | 1 – 15 |
| Mounting hole diameter | 4.5 mm | 2 – 8 |
| Cover height | 10 mm | 4 – 25 |
| Shaft diameter | 8 mm | 4 – 20 |
| Shaft length | 120 mm | 60 – 250 |
| Shaft centre distance | 37.5 mm | 20 – 80 |
| Hand crank diameter | 30 mm | 15 – 60 |
| Gear module | 1.5 mm | 0.8 – 3 |
| Gear face width | 10 mm | 3 – 25 |
| Small gear tooth count | 20 mm | 10 – 40 |
| Large gear tooth count | 30 mm | 15 – 60 |
| Selector drum diameter | 25 mm | 12 – 50 |
| Selector drum length | 45 mm | 20 – 90 |
| Fork width | 40 mm | 20 – 80 |
| Fork slot width | 10 mm | 4 – 25 |
| Dog clutch diameter | 22 mm | 10 – 45 |
| Dog clutch length | 12 mm | 5 – 30 |
| Selector lever length | 50 mm | 20 – 100 |
| Selector lever shaft diameter | 6 mm | 3 – 15 |
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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