Give the module, this gear's tooth count and its mate's, and the shaft angle — the generator sets both pitch cones from them, so the two gears you make meet at a common apex and mesh. The teeth are our spur gears' hob-generated involute, laid on each gear's back cone (Tredgold's method) and running straight to the apex.
The real generator runs in your browser: set the parameters, then download STEP or STL. Nothing to install, no sign-up.
The first open downloads the CAD engine (about 20 MB).
Each parameter below rebuilds real geometry on every change — this is parametric CAD, not a scaled mesh.
| Parameter | Default | Range | What it does |
|---|---|---|---|
| Module (large end)MODULE | 1.5 mm | 1 – 3 | Measured at the large end, as KHK and MISUMI list it; both gears share it. |
| Number of teethTEETH | 20 | 12 – 40 | This gear. |
| Mating gear teethMATE_TEETH | 20 | 12 – 60 | The other gear; with the shaft angle it sets both pitch cones. |
| Shaft angleSHAFT_ANGLE | 90 ° | 45 – 120 | Angle between the two shafts. |
| Pressure anglePRESSURE_ANGLE | 20 ° | 20 / 25 | 20° on every catalogue bevel gear. |
| Bore styleBORE_STYLE | circular | none / circular / hex | Round shaft or hex socket. |
| Bore sizeBORE_D | 8 mm | 2 – 20 | Shaft diameter, or hex across flats; KHK's PM1.5-20 is bored 8. |
| Hub lengthHUB_LENGTH | 13 mm | 0 – 30 | Hub on the back, sized like KHK's PM1.5-20 (Ø26 × 13) but kept just inside the tooth roots: Ø24.1 at the defaults. |
Every parameter can go in the page's link, so one link opens exactly the part you want. Example (15-tooth pinion of a 1:2 pair (its mate: 30 teeth)):https://www.forgent3d.com/en/generators/bevel-gear-generator?TEETH=15&MATE_TEETH=30
STEP AP214 in millimetres, exact B-rep — it opens directly in SolidWorks, Fusion, FreeCAD, Onshape or Inventor, and goes straight into a CNC quote form. STL for the slicer is one click too.
| This generator | Typical online STL generator | Vendor CAD library | |
|---|---|---|---|
| Any size within the range | Yes | Yes | Catalog sizes only |
| STEP with exact surfaces | Yes | Usually an STL mesh only | Yes |
| Changes the sliders don't cover | “AI edit” on the page | No | No |
| Account needed to download | No | Usually no | Often |
Every parameter is a link parameter; the link below opens the example part. ChatGPT, Claude or any assistant can write one like it from the parameter list (names, units, ranges) at: parameter list (JSON)
Example: https://www.forgent3d.com/en/generators/bevel-gear-generator?TEETH=15&MATE_TEETH=30
Press “AI edit” in the generator and say what to change — a keyway, holes, a different shape. The AI edits the part's model.py and it rebuilds in your browser, with undo. A few edits a day are free without signing in; to keep the result or go further, copy it into your models and continue with the AI agent.
Edit with AI →For bigger changes, several rounds, or a part you want to keep: copy it into your models (free account). The Forgent3D AI agent reads the model.py, edits it, rebuilds it and checks the result itself.
Copy and continue with the AI agent →Their pitch cones must share one apex, where the two shafts cross. With the defaults (module 1.5, 20/20 at 90°) the apex sits 15 mm above the gear's large end — 28 mm above the bottom of its 13 mm hub.
On its back — hub down, teeth up — as makers print them; one maker who printed small bevels teeth-down on a ring had teeth shear off. No supports needed; 3–6 walls, PETG for gears that work.
Each change rebuilds the gear in your browser, and building only the one you are looking at keeps that quick. Both gears come from the same page: swap TEETH and MATE_TEETH for the mate.
Make both from the same page: https://www.forgent3d.com/en/generators/bevel-gear-generator?TEETH=15&MATE_TEETH=30 is the pinion and https://www.forgent3d.com/en/generators/bevel-gear-generator?TEETH=30&MATE_TEETH=15 its mate — KHK's stock 1:2 pair. Mount them so their cone apexes meet where the shafts cross.
Yes, set the shaft angle: https://www.forgent3d.com/en/generators/bevel-gear-generator?SHAFT_ANGLE=60 — KHK sells angular miters at 45°, 60° and 120°, and the generator takes anything from 45° to 120°.
Yes. Models you generate and the STL / STEP files you export are yours: print them, sell the prints, or use them in a product. No attribution to Forgent3D is required.
Already have your own .scad file? Convert OpenSCAD to STEP → · Preview it in the browser →
