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Spool hanger collars: clamp a tri-clamp spool to 2020 extrusion over the flame (1.5, 2, 3 in)
How do I hold a tri-clamp Stirling engine upright over a flame? · Hardware · basis: 16 ga tube OD (38.1 / 50.8 / 76.2) from the tri-clamp spool entry; 2020 slot pitch for the mounting tab
Long Earth Society build part. How the vertical tri-clamp engines stand. The engines
- sizes
- 3 in table
Notes
- A split collar bored to the tube OD with a 1 mm split each side, closed with two M4 screws, holds the spool anywhere along its cold half; the bar half takes two M5 screws and T-nuts into a horizontal 2020 crossbar between two uprights, so a vertical beta, free-piston or thermoacoustic engine hangs with its hot end over a tea light or burner and the base stays cool.
- Clamp on the cold side only; two collars on two uprights for a long spool. For a horizontal gamma use the base plate instead.
- LES: how the vertical engines stand.
- Fits are designed in: every hole is the mating part's size plus the clearance for the joint (press 0, slide +0.2, running pin +0.3, bearing / magnet / nut pocket +0.2, large sleeve +0.3 mm on diameter), so the parts print and go together as they are, in any material. Tapped holes are 2.5 mm for M3.
Sizes
| size | tube_od_mm | collar_id_mm | width_mm | closure | mount |
|---|---|---|---|---|---|
| 1.5 | 38.1 | 38.1 | 16 | 2 × M4 × 30 + nuts | 2 × M5 at 66.1 mm to a 2020 crossbar |
| 2 | 50.8 | 50.8 | 16 | 2 × M4 × 30 + nuts | 2 × M5 at 78.8 mm to a 2020 crossbar |
| 3 | 76.2 | 76.2 | 16 | 2 × M4 × 30 + nuts | 2 × M5 at 104.2 mm to a 2020 crossbar |
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 6 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| hanger-1.5in-tab | 1.5 in spool hanger, half with the mounting bar: clamps the Ø38.1 tube; 2 × M5 at 66.1 mm centres into a horizontal 2020 crossbar's slot | STEP · STL |
| hanger-1.5in-plain | 1.5 in spool hanger, plain half: 2 × M4 × 30 close it on the tube | STEP · STL |
| hanger-2in-tab | 2 in spool hanger, half with the mounting bar: clamps the Ø50.8 tube; 2 × M5 at 78.8 mm centres into a horizontal 2020 crossbar's slot | STEP · STL |
| hanger-2in-plain | 2 in spool hanger, plain half: 2 × M4 × 30 close it on the tube | STEP · STL |
| hanger-3in-tab | 3 in spool hanger, half with the mounting bar: clamps the Ø76.2 tube; 2 × M5 at 104.2 mm centres into a horizontal 2020 crossbar's slot | STEP · STL |
| hanger-3in-plain | 3 in spool hanger, plain half: 2 × M4 × 30 close it on the tube | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=spool-hanger-collars
How it fits
Goes in or on
Tri-clamp spool, 1.5 and 2 inchclamps the 16 ga tube
Tri-clamp cupssame tube ODConnects to
Aluminium T-slot extrusionbolts to a 2020 crossbarAlternatives
Gamma framehorizontal engines sit on the base plateAlso needed
T-slot attachmentsM5 T-nuts, corner brackets
Socket head cap screws, M2–M8M4 × 30 and M5 screwsIn these build lists
Thermoacoustic standing-wave engine, 2 in spoolsNo pistons: a printed stack in a λ/4 tube of spools; a speaker turns the sound i…Beta Stirling, rhombic drive, 2 in tri-clampDisplacer and piston in one bore, two counter-rotating gears: the balanced one.Free-piston Stirling, 2 in tri-clampNo crank: displacer rod through the piston, both hung on spiral flexure stacks; …Questions
How do I mount a vertical tri-clamp Stirling engine?
Clamp a spool hanger collar around the cold half of the tube and bolt its bar to a horizontal 2020 crossbar with two M5 screws and T-nuts; the hot end hangs over the flame.