Xem Studiomeasured geometryLibrary › Hardware › Stirling & thermoacoustic ·
Leaf hub collars: Ø12 and Ø18 bore, M3 grub
How is a flexure leaf's hub held on its rod? · Hardware · basis: Design values of the free-piston generator; M3 grub (ISO 4026) in an Ø2.5 tapped hole
Long Earth Society build part. Hub collars of my free-piston generator. 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
- 2 in table
Notes
- The leaf's hub is clamped axially between a shoulder and a collar (leaf B: the displacer cap's boss and one Ø20 collar) or between two collars (leaves C and D on the Ø18 tube rod). Each collar holds with one M3 × 4 grub.
- Fit: the collar bores slide on the rod or tube and are held by the grub.
Sizes
| collar | od_mm | bore_mm | h_mm |
|---|---|---|---|
| displacer | 20 | 12 | 5 |
| piston | 28 | 18 | 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 | Ø12 / Ø18 | displacer rod / tube rod (M3 grub) | slide | all |
| grub hole | Ø2.5 | M3 tap drill | 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 2 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| fpse-collar-12x20 | collar Ø20 × 5, Ø12 bore, M3 tapped radial hole (Ø2.5): clamps leaf B's hub on the displacer rod against the cap's boss | STEP · STL |
| fpse-collar-18x28 | collar Ø28 × 5, Ø18 bore, M3 tapped radial hole (Ø2.5): two per piston leaf, either side of its hub on the tube rod | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=fpse-hub-collars
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
How many?
One Ø12 (leaf B) and four Ø18 (leaves C and D).