# Tri-clamp honed cylinder spool: 2 in × 6 in, bore finished Ø48.00

> Can a tri-clamp spool be a piston cylinder?

- Category: Stirling engines › Tri-clamp engine parts
- Kind: Hardware
- Basis: Standard 2 in × 6 in spool (ASME BPE tube Ø50.8 × 1.65, ISO 2852 faces) with the bore opened from Ø47.5 to Ø48.00 so it is round, straight and finished along its whole length
- Page: https://xemstudio.com/objects/tri-clamp-honed-cylinder-spool/ · JSON: https://xemstudio.com/api/geometry?object=tri-clamp-honed-cylinder-spool · Plain text: https://xemstudio.com/objects/tri-clamp-honed-cylinder-spool/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

- A standard 6 in spool sent out to have its bore finished: Ø48.00 through the tube and both ferrules, so the free-piston mover's sleeve (Ø48.00) runs in it as a clearance seal with no contact. The finish and roundness are the machinist's to hold; the fit class says what the bore is for.
- Opening 47.5 to 48.00 leaves a 1.40 wall: at a 30 bar relief setting the hoop stress is p·D / 2t = 3.0 × 48 / 2.8 ≈ 51 MPa.
- The ferrule faces are untouched clamp faces. The Type B gasket's lip (Ø45.3) stands 1.95 into the bore at each end, so the mover never reaches the last 3 mm at either face (Mating features).
- On the thermoacoustic generators the alternator's coils and return shell clamp round this spool's tube: the magnets move inside, the coils stay outside, and no wire passes through the pressure wall.

## 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 |
|---|---|---|---|---|
| finished bore | Ø48.00 × 152.4, through tube and both ferrules | mover sleeve Ø48.00: clearance seal, no contact | run | all |
| faces | ISO 2852, 2 in, recess opened to the Ø48.00 bore | standard clamp + Type B gasket | clamp | all |
| tube outside | Ø50.8 between the ferrule hubs | stator bobbin bore Ø50.8 | clamp | all |

## Sizes

| feature | value |
|---|---|
| bore | Ø48.00 × 152.4 (through) |
| tube OD | Ø50.8 |
| wall after finishing | 1.40 |
| faces | ISO 2852, 2 in |

## Where the files are

- ASME: [BPE Bioprocessing Equipment (clamp fitting dimensions, tube OD and wall)](https://www.asme.org/codes-standards/find-codes-standards/bpe-bioprocessing-equipment) — standard — ASME; dimensions are facts (verify at link)
- ISO (via iTeh sample): [ISO 2852 clamp liners: face profile and flange / groove diameters](https://cdn.standards.iteh.ai/samples/7850/eb49c396488d408c8ced3e2961d76cf3/ISO-2852-1974.pdf) — PDF — standard excerpt; dimensions are facts
- 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-honed-cylinder-spool/index.json

- spool-2in-6in-honed-48.00: [STEP](https://xemstudio.com/files/hardware/tri-clamp-honed-cylinder-spool/spool-2in-6in-honed-48.00.step) · [STL](https://xemstudio.com/files/hardware/tri-clamp-honed-cylinder-spool/spool-2in-6in-honed-48.00.stl) — 2 in × 6 in spool (152.4 face to face) with the bore finished to Ø48.00 over the full length, tube and both ferrules; wall left 1.40

## Questions

**Why 48.00?**

It is the smallest round number that cleans up a 47.5 nominal sanitary bore along its whole length and leaves a usable wall.

**What clearance does the piston get?**

The drawing is exact: bore and sleeve are both Ø48.00. The running fit is the machinist's: the mover's sleeve is finished to give the clearance-seal gap the fit class asks for.

## Fits with

- [Free-piston mover for a 2 in honed spool: piston and alternator magnets in one, Ø48.00 × 130](https://xemstudio.com/objects/free-piston-mover-2in/)
- [Linear-alternator stator that clamps round a 2 in tri-clamp tube: four coils outside the pressure wall](https://xemstudio.com/objects/canned-linear-alternator-stator-2in/)
- [Tri-clamp flexure carrier: clamp-in 2 in, two Ø40 flexure stacks](https://xemstudio.com/objects/tri-clamp-flexure-carrier/)
- [Build list: Thermoacoustic-Stirling ring generator, three 2 in units, pressurised](https://xemstudio.com/objects/list-ta-ring-3x2in/)