{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "htd-burner-shroud-10in",
 "name": "Burner shroud for a 10 in hot cup (optional)",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Tri-clamp engine parts",
 "year": null,
 "question": "How do I keep a burner's flame on the bottom of a big tri-clamp pot?",
 "tags": [
  "shroud",
  "burner",
  "htd",
  "heat exchanger"
 ],
 "aliases": [
  "burner shroud stirling"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/htd-burner-shroud-10in/",
 "sheet_txt": "https://xemstudio.com/objects/htd-burner-shroud-10in/sheet.txt",
 "sheet": {
  "basis": "Exact geometry",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "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."
  ],
  "table": {
   "columns": [
    "id_mm",
    "od_mm",
    "z_mm"
   ],
   "rows": [
    [
     272,
     276,
     "100–190"
    ]
   ]
  }
 },
 "sheet_text": "Burner shroud for a 10 in hot cup (optional) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/htd-burner-shroud-10in/  (CC BY 4.0)\nBasis: Exact geometry\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 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.\n\nid_mm  od_mm  z_mm\n272.0  276.0  100–190\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/htd-burner-shroud-10in/index.json\nAPI: https://xemstudio.com/api/geometry?object=htd-burner-shroud-10in\n",
 "sources": [
  {
   "publisher": "Long Earth Society",
   "title": "Engine builds",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "list-htd-10in",
  "htd-burner-stand-10in"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn.",
 "mating": [
  {
   "feature": "bore",
   "exact": "Ø272",
   "mates": "hot cup Ø254 (9 radial, flue)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "tab holes",
   "exact": "Ø5.5",
   "mates": "shcs-m5x20",
   "fit": "designed",
   "files": "all"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. Typical FDM: hole +0.0 to +0.1 mm on diameter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. Typical FDM: +0.2 mm.",
  "run": "turns or slides in use: pin in a link, rod through a guide. Typical FDM: +0.3 mm.",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. Typical FDM: +0.3 mm.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "Is the shroud needed?",
   "a": "No: it keeps more of the flame on the floor."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "burner-shroud-10in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "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",
   "note": "burner shroud (heat exchanger, optional): tube Ø272/Ø276 z 100..190 round the cup floor, three tabs to the legs"
  }
 ],
 "markdown": "https://xemstudio.com/objects/htd-burner-shroud-10in/index.md"
}