# Burner shroud for a 10 in hot cup (optional)

> How do I keep a burner's flame on the bottom of a big tri-clamp pot?

- Category: Stirling engines › Tri-clamp engine parts
- Kind: Hardware
- Basis: Exact geometry
- Page: https://xemstudio.com/objects/htd-burner-shroud-10in/ · JSON: https://xemstudio.com/api/geometry?object=htd-burner-shroud-10in · Plain text: https://xemstudio.com/objects/htd-burner-shroud-10in/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 separate heat exchanger, optional: a sleeve round the cup's lower end that holds the flame against the floor and the lower wall. Three tabs bolt to the stand's legs (M5 × 20 and nuts). The engine runs without it.

## 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 |
|---|---|---|---|---|
| bore | Ø272 | hot cup Ø254 (9 radial, flue) | designed | all |
| tab holes | Ø5.5 | shcs-m5x20 | designed | all |

## Sizes

| id_mm | od_mm | z_mm |
|---|---|---|
| 272.0 | 276.0 | 100–190 |

## 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/htd-burner-shroud-10in/index.json

- burner-shroud-10in: [STEP](https://xemstudio.com/files/hardware/htd-burner-shroud-10in/burner-shroud-10in.step) · [STL](https://xemstudio.com/files/hardware/htd-burner-shroud-10in/burner-shroud-10in.stl) — burner shroud (heat exchanger, optional): tube Ø272/Ø276 z 100..190 round the cup floor, three tabs to the legs

## Questions

**Is the shroud needed?**

No: it keeps more of the flame on the floor.

## Fits with

- [Build list: HTD engine, 10 in tri-clamp (high-temperature-differential flat engine)](https://xemstudio.com/objects/list-htd-10in/)
- [Burner stand for a 10 in tri-clamp pot](https://xemstudio.com/objects/htd-burner-stand-10in/)