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Conoid (curved cone) pulley Ø24–Ø56 × 64, profile for constant open-belt length at 110 mm
Why are some speed cones curved? · Modern device · basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
Also called: conoid pulley, curved cone pulley, speed cone, polea conoide, Kegelscheibe mit gewölbtem Profil
Exact dimensions. True size, with no printing tolerance added.
- length
- 71.26 mm
- width
- 71.26 mm
- height
- 64.0 mm
Notes
- A pair of these, mounted head to tail 110 mm apart, keeps an open belt at exactly the same length wherever it runs: the generatrix is r(z) = (s + 2g)/2 with g = (z − 32)/4 and s chosen so 2√(C² − d²) + πs + 2d·asin(d/C) stays 2C + 40π (d = −2g).
- The curve bulges up to 8.37 mm outside a straight cone near the ends; a flat belt touches it on its centre line.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).
Conoid (curved cone) pulley Ø24–Ø56 × 64, profile for constant… size chart
| dimension | value |
|---|---|
| diameters | Ø24 → Ø56 |
| length | 64 mm |
| profile | exact constant-belt-length curve for C = 110 |
| bore | Ø8 |
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. 10: 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
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=conoid-pulley-24-56x64-bore8
Fits with
Questions
Why are some speed cones curved?
A pair of these, mounted head to tail 110 mm apart, keeps an open belt at exactly the same length wherever it runs: the generatrix is r(z) = (s + 2g)/2 with g = (z − 32)/4 and s chosen so 2√(C² − d²) + πs + 2d·asin(d/C) stays 2C + 40π (d = −2g).