Xem Studiomeasured geometryLibrary › Mechanisms › Gears ·
Elliptical gear, module 1.5, 36 teeth, b/a = 0.75, bore at the centre
What is a centre-pivoted elliptical gear for? · Modern device · basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
Also called: elliptical gear, oval gear, engranaje elíptico, elliptisches Zahnrad
Exact dimensions. True size, with no printing tolerance added.
- length
- 64.18 mm
- width
- 48.97 mm
- height
- 12.0 mm
Notes
- Pitch ellipse 61.4 × 46.05 mm (perimeter 36 × π × 1.5) with the Ø8 bore at its centre; teeth generated by a 20° basic rack rolled round the pitch curve (spline outline within 0.008 mm), so it meshes with any module 1.5 involute pinion whose centre is free to follow the curve.
- Turning on its centre, its pitch radius at the mesh swings between the semi-axes twice per turn; the pinion must be free to move in and out to stay in mesh. 12 mm face.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).
Elliptical gear, module 1.5, 36 teeth, b/a = 0.75, bore at the centre size chart
| dimension | value |
|---|---|
| module | 1.5 |
| teeth | 36 |
| pitch ellipse | 61.4 × 46.05 mm |
| bore | Ø8 at the centre |
| face | 12 mm |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Henry T. Brown (1868, public domain) | Five Hundred and Seven Mechanical Movements — scan on archive.org | web | Publisher's page; dimensions are facts |
| 507movements.com | Brown's movement No. 35: figure, his text and an animation | web | Publisher's page; dimensions are facts |
| Xem Studio | drawing | web | Publisher's page; dimensions are facts |
Free files
★ Free files 1 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json
| elliptical-gear-m1-5-36t-centre-bore | gear, centre on the Z axis, major axis along X, z 0..12 | STEP · STL |
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=elliptical-gear-m1-5-36t-centre-bore
Fits with
Questions
What is a centre-pivoted elliptical gear for?
Pitch ellipse 61.4 × 46.05 mm (perimeter 36 × π × 1.5) with the Ø8 bore at its centre; teeth generated by a 20° basic rack rolled round the pitch curve (spline outline within 0.008 mm), so it meshes with any module 1.5 involute pinion whose centre is free to follow the curve.