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Slip-on fin sleeve for a 2 in closed hot end (nine Ø76 ring fins)
How do I add fins to a plain tri-clamp hot end? · Hardware · basis: Design values; fin set as the finned hot head on this site so the same burner shroud fits
Long Earth Society build part. The fins of my performance engines' 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
- A separate part: a finned cup that slides over the closed end of a 2 in hot spool and sits on it. Bore Ø50.8 (the tube's OD) and an inside bottom shaped to the closed end, so the heat crosses where they touch. Nine Ø76 × 1.5 ring fins at 5 mm pitch take the flame's heat in the burner shroud.
- Optional: the engine runs without it at a lower hot-wall temperature for the same flame.
Sizes
| feature | value |
|---|---|
| bore | Ø50.8 |
| depth | 45.0 |
| fins | 9 × Ø76 × 1.5, 5 pitch |
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 with a 1.5 inner round at the bottom | 2 in tube OD and closed end | slide | all |
| fins | 9 × Ø76 × 1.5, 5 pitch | burner shroud Ø88 bore (gas annulus) | 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-2in-9x76 | slip-on hot-end fin sleeve for a 2 in closed end: cup, bore Ø50.8 with the closed end's 1.5 round inside its bottom, wall 2, bottom 2, 45.0 deep; 9 ring fins Ø76 × 1.5 at 5 pitch | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=tri-clamp-ring-fin-sleeve
How it fits
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Questions
Does it have to be a press fit?
No: it slides on and sits on the closed end; at temperature the fit closes up if the sleeve grows less than the tube.