Involute Gear Generator
Generate parametric involute gears online with 8 gear types, 5 bore shapes, and full profile control. Export STL for 3D printing.
What Is an Involute Gear Generator?
An involute gear generator is a parametric tool that builds gear models using the involute tooth profile — the standard used in most mechanical transmissions. This gear generator computes geometry entirely in your browser, so there are no server round-trips or file uploads.
Choose a gear type, set module and teeth count, configure bore and profile parameters, then click Generate to render the 3D model. Once rendered you can orbit the preview and export a binary STL for slicing.
Gear Generator Parameters
| Parameter | Range | Description |
|---|---|---|
| Gear Type | 8 types | Spur, helical, ring, crown, bevel, rack, worm, and worm gear. |
| Module | ≥ 0.1 | ISO tooth size factor. Pitch diameter = module × teeth. |
| Teeth Count | ≥ 5 | Number of teeth on the gear. |
| Pressure Angle | 10–45° | Standard is 20°. Higher angles increase tooth strength. |
| Thickness | ≥ 1 mm | Gear body thickness (not shown for crown, bevel, or worm gear). |
| Bore Shape | 5 types | Round, hex, D-cut, double-flat, or solid (no bore). |
| Helix Angle | 0–60° | For helical, ring, and rack types. Enables herringbone toggle. |
| Backlash / Clearance | ≥ 0 mm | Fine-tune mesh tolerance for mating gear pairs. |
| Chamfer | 0–5 mm | Optional top/bottom edge chamfer on the gear body. |
| Boss (Top / Bottom) | Diameter + height | Optional hub protrusions for shaft support. |
| Weight Reduction | Count + size | Circular cutout holes to reduce gear mass. |
How to Use the Gear Generator
- Select a gear type from the dropdown (spur, helical, bevel, etc.).
- Set module and teeth count — the derived pitch/outside/root diameters update automatically.
- Adjust profile settings: pressure angle, backlash, clearance, and helix angle where applicable.
- Configure bore shape and diameter, add bosses or weight-reduction holes if needed.
- Click Generate Model to render the gear in the background.
- Orbit the 3D preview to inspect the result, then click Export STL.
Key Features
- 8 gear types in one tool: spur, helical, ring, crown, bevel, rack, worm, and worm gear.
- 5 bore shapes — round, hex, D-cut, double-flat, and solid — with tolerance and chamfer control.
- Herringbone toggle for helical and ring gears, spiral angle for bevel gears.
- Top and bottom boss hubs with independent diameter and height settings.
- Weight-reduction cutouts with configurable hole count, radius, and size.
- Rack-specific side mounting holes with adjustable count, diameter, and height.
- Worm drive parameters: worm diameter, starts, mate settings, arc, and crowning.
- Binary STL export with filenames that include module and teeth count.
Gear Generator FAQ
What does the module parameter control in this gear generator?
Module is the ISO tooth size factor. Pitch diameter equals module times the number of teeth. A module of 1 with 20 teeth gives a 20 mm pitch diameter. The tool also shows derived outside and root diameters in a read-only section.
How long does rendering take?
Rendering runs in a background thread. Simple spur gears finish in under a second; complex worm gears or high-teeth bevel gears may take several seconds. A progress bar is shown while rendering.
Can I generate herringbone (double-helix) gears?
Yes. Select helical or ring gear type, set a helix angle, and enable the Herringbone toggle. The gear generator splits the body into two mirrored halves with opposing helix directions.
What file format does the gear generator export?
The gear generator exports a binary STL file ready for slicing. Filenames include the module and teeth count (e.g. gear_1m_20t.stl) so you can identify each variant at a glance.
Try More Parametric Tools
Need boxes or fasteners? Continue with our dedicated tool pages, or open the homepage to use all three generators.