# Frame for the tri-clamp walking-beam gamma

> What frame holds a tri-clamp walking-beam Stirling?

- Category: Hardware › Stirling & thermoacoustic
- Kind: Hardware
- Basis: Design values
- Page: https://xemstudio.com/objects/tri-clamp-walking-beam-gamma-frame/ · JSON: https://xemstudio.com/api/geometry?object=tri-clamp-walking-beam-gamma-frame · Plain text: https://xemstudio.com/objects/tri-clamp-walking-beam-gamma-frame/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**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.

## Notes

- One base: cradles under the hot spool and the tee, the beam's post, the crank's two uprights and the generator bracket.

## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn)

| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| crank uprights | Ø22 × 7 pockets | 608 bearing OD | press | all |
| pivot cheeks | Ø5 | Ø5 dowel pivot pin | press | all |
| cradles | Ø50.8 seats | hot-spool and tee OD | designed | all |
| tapped holes | M4 Ø3.3, M3 bracket Ø3.4 + 90° countersink | torch stand, shroud, generator | designed | all |

## Sizes

| feature | value |
|---|---|
| base | 730 × 175 × 8 |
| run axis | 138 above the bench |
| pivot | 626.4 above the bench |

## Where the files are

- Long Earth Society: [Engine builds](https://longearthsociety.com/engineering/) — web, video — LES site

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/tri-clamp-walking-beam-gamma-frame/index.json

- walking-beam-gamma-frame-2in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-walking-beam-gamma-frame/walking-beam-gamma-frame-2in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-walking-beam-gamma-frame/walking-beam-gamma-frame-2in.stl) — walking-beam gamma frame: base 730 × 175 × 8, two cradles, beam post with cheeks (Ø5 pivot holes), two crank uprights with 608 pockets, generator bracket, torch-stand and shroud holes (M4 tapped)

## Questions

**How tall is it?**

The beam pivot is 626 mm above the bench: the 6 in bounce spool sits under the piston-rod gland.

## Fits with

- [Build list: Tri-clamp walking-beam gamma generator, 2 in, chargeable](https://xemstudio.com/objects/list-tri-clamp-walking-beam-gamma/)