Xem Studiomeasured geometryLibrary › Hardware › Stirling & thermoacoustic ·
Walking beam for a tri-clamp beam engine (arms 158.07 / 131.73)
How do I build a walking beam for a vertical power cylinder? · Hardware · basis: Design values; 625 and dowel sizes from their standards
Long Earth Society build part. The beam of my walking-beam engine. 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
- 4 in table
Notes
- A T-shaped beam on two 625 bearings on a Ø5 pivot pin in the post's cheeks. Arm A (158.62) carries a Ø6 pin for the 60 mm link from the piston rod's crosshead; arm B (132.18) a Ø5 pin for the 488.4 mm link down to the crank. The arm ratio 1.2 turns the crank's 30 mm throw into the piston's 36 mm stroke.
Sizes
| feature | value |
|---|---|
| arm A | 158.62 |
| arm B | 132.18 |
| pivot | Ø16 bore, two 625 |
| swing | ±6.5° |
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 |
|---|---|---|---|---|
| pivot bore | Ø16 × 10 | two 625 bearings | press | all |
| end A hole | Ø6 | Ø6 dowel pin (link A) | press | all |
| end B hole | Ø5 | Ø5 dowel pin (link B) | press | 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
| walking-beam-158.07-131.73 | walking beam 10 thick: pivot boss Ø30 with an Ø16 bore (two 625), end A Ø6 press hole 158.62 from the pivot, end B Ø5 press hole 132.18 from it, bar 16 high, stem to 40 below the pivot | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=stirling-walking-beam
How it fits
In these build lists
Tri-clamp walking-beam gamma generator, 2 in,…The classic desk walking-beam Stirling in tri-clamp: a standard 2 in tee with th…Tri-clamp twin walking-beam gamma generator, 2…Two walking-beam tee units side by side on one crank, a quarter turn apart: each…You might also need
Questions
Why a beam?
It is the classic desk layout: the power cylinder stands up from the middle of the displacer cylinder and the beam brings its motion to the same crank as the displacer.