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Clamp-on hot-end fin sleeve for a 2 in tri-clamp tube (optional)
How do I add fins to a plain tri-clamp hot end? · Hardware · basis: Design values: ring fins Ø76 × 1.5 at 5 pitch, two halves clamping the Ø50.8 tube
Long Earth Society build part. Optional fins on my free-piston generator's hot end. The engines
Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features
- sizes
- 3 in table
Notes
- Two halves with 14 ring fins that clamp onto the lower 66 mm of the closed-end spool with 4 × M4 × 16: the flame passes between the fins inside the shroud. The spool itself stays plain.
- Optional: without it the flame heats the bare tube; the analysis on the performance page assumes the inside wall at 800 K either way, and the sleeve is how a burner gets there with less flame.
Sizes
| feature | value |
|---|---|
| fins | 14 × Ø76 × 1.5, pitch 5 |
| bore | Ø50.8 (clamp) |
| height | 2–68.5 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| bore | Ø50.8 | hot spool tube OD | clamp | all |
| split | 1.0 total (0.5 per half) | the other half | clamp | all |
| ear holes | Ø4.5 | M4 clearance (ISO 273 medium) | designed | all |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Long Earth Society | Engine builds | web, video | LES site |
Free files
★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| fin-sleeve-half-2in-76 | fin sleeve half (optional): bore Ø50.8 from 2 to 68.5 above the hot end, 14 ring fins Ø76 × 1.5 at 5 pitch, ears with 2 × M4 each side | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=tri-clamp-hot-end-fin-sleeve
How it fits
In these build lists
Free-piston Stirling generator, 2 in tri-clamp…A real free-piston Stirling generator in standard 2 in sanitary fittings: closed…You might also need
Questions
Is it required?
No; it is a heat exchanger and every heat exchanger on this engine is optional.