# Crosshead guide, Ø8 bore × 30

> What guide does an 8 mm crosshead run in?

- Category: Stirling engines › Drives & mechanisms
- Kind: Hardware
- Basis: Bore at the Ø8 crosshead (fit: run); M3 clearance Ø3.4 (ISO 273)
- Page: https://xemstudio.com/objects/crosshead-guide-8mm/ · JSON: https://xemstudio.com/api/geometry?object=crosshead-guide-8mm · Plain text: https://xemstudio.com/objects/crosshead-guide-8mm/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

- A tube Ø16 outside with a Ø8 bore, 30 long, that the Ø8 crosshead runs in (fit: run).
- A 32 × 10 × 4 flange at its base has 2 × Ø3.4 holes 22 mm apart for M3 screws.

## 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 |
|---|---|---|---|---|
| guide bore | Ø8 | crosshead OD | run | crosshead-guide-* |
| guide flange holes | Ø3.4 | M3 screw clearance | designed | crosshead-guide-* |

## Sizes

| parameter | value |
|---|---|
| bore | 8 |
| outside | 16 |
| length | 30 |
| flange | 32 × 10 × 4 |
| holes | 2 × Ø3.4 at 22 |

## Where the files are

- Wikipedia: [Crosshead](https://en.wikipedia.org/wiki/Crosshead) — web — CC BY-SA 4.0 (text)
- Wikipedia: [Piston](https://en.wikipedia.org/wiki/Piston) — web — CC BY-SA 4.0 (text)
- James R. Senft: [Miniature Stirling engine piston fits (LTD book)](https://www.stirlingengine.com/) — book — reference (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/crosshead-guide-8mm/index.json

- crosshead-guide-8mm: [STEP](https://xemstudio.com/files/hardware/power-cylinder-piston-crosshead/crosshead-guide-8mm.step) · [STL](https://xemstudio.com/files/hardware/power-cylinder-piston-crosshead/crosshead-guide-8mm.stl) — crosshead guide: Ø8 bore (the crosshead OD, exact) × 30, flange with 2 × M3 clearance (Ø3.4)

## How it fits

### Goes in or on
- [Base plate for 1.5, 2 and 3 in tri-clamp Stirling engines](https://xemstudio.com/objects/tri-clamp-engine-base-plate/): flanged to the frame in line with the liner

### Connects to
- [Crosshead Ø8 × 24 for a Ø3 piston rod](https://xemstudio.com/objects/crosshead-8mm/): crosshead runs in the bore

### Also needed
- [Socket head cap screws, M2–M8 (ISO 4762 / DIN 912)](https://xemstudio.com/objects/socket-head-cap-screws-metric/): 2 × M3

## Questions

**What bore is the crosshead guide?**

Ø8, the crosshead's outside diameter; fit: run.

**How is the crosshead guide mounted?**

Two M3 screws through the flange, 22 mm apart.

## Fits with

- [Crosshead Ø8 × 24 for a Ø3 piston rod](https://xemstudio.com/objects/crosshead-8mm/)
- [Flanged power cylinder liner Ø16, 20, 25, 30](https://xemstudio.com/objects/power-cylinder-liner/)
- [Power piston Ø16, 20, 25, 30 with Ø3 wrist-pin boss](https://xemstudio.com/objects/power-piston/)