# Frame for the 2 in tri-clamp cross diaphragm gamma

> What holds the tri-clamp cross diaphragm gamma on the bench?

- Category: Hardware › Stirling & thermoacoustic
- Kind: Hardware
- Basis: Positions from the engine layout (tools/gen_cross_engine.py cross_layout); ISO 273 medium clearance for M5; Ø3.3 for an M4 thread
- Page: https://xemstudio.com/objects/tri-clamp-cross-engine-frame/ · JSON: https://xemstudio.com/api/geometry?object=tri-clamp-cross-engine-frame · Plain text: https://xemstudio.com/objects/tri-clamp-cross-engine-frame/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

**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 piece: a base plate with the torch stand on it, and a wall behind the engine. The 2 in spool hanger clamps the cross's lower run and its bar bolts to the wall with two M5 × 25 and nuts, so the whole engine hangs over the flame.
- A window in the wall leaves room for the jacket's fill port and the heat shield.

## 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 |
|---|---|---|---|---|
| hanger holes | 2 × Ø5.5 | M5 clearance (ISO 273 medium) | designed | all |
| torch-stand holes | 2 × Ø3.3 (M4 tapped) | shcs-m4x10 | designed | all |
| wall face | flat, 39.4 from the run axis | spool hanger bar | designed | all |

## Sizes

| feature | value |
|---|---|
| base | 140 × 150 × 8 |
| wall | 124 × 10, top 227.5 |
| hanger screws | 2 × Ø5.5 at x ±39.4, z 213.5 |
| torch stand | 2 × Ø3.3 at x ±25, y 28 |

## Where the files are

- ISO: [ISO 273 clearance holes for bolts and screws (fine / medium / coarse)](https://www.iso.org/standard/4196.html) — standard — dimensions are facts (verify at link)
- 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-cross-engine-frame/index.json

- cross-engine-frame-2in: [STEP](https://xemstudio.com/files/hardware/tri-clamp-cross-engine-frame/cross-engine-frame-2in.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-cross-engine-frame/cross-engine-frame-2in.stl) — frame: base 140 × 150 × 8, wall 124 × 10 to 227.5 with a 60 wide window, 2 gussets, 2 × Ø5.5 for the spool hanger at 213.5, 2 × Ø3.3 (M4 thread) for the torch stand

## Questions

**What does the frame carry?**

The torch stand on the base and the engine on the spool hanger at the wall.

## Fits with

- [Build list: Tri-clamp cross diaphragm gamma, 2 in](https://xemstudio.com/objects/list-tri-clamp-cross-diaphragm-gamma/)
- [Spool hanger collars: clamp a tri-clamp spool to 2020 extrusion over the flame (1.5, 2, 3 in)](https://xemstudio.com/objects/spool-hanger-collars/)
- [Torch stand for a horizontal tri-clamp hot leg](https://xemstudio.com/objects/tri-clamp-torch-stand/)