{
 "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": "tri-clamp-burner-shroud",
 "name": "Burner shroud for a 2 in tri-clamp hot end",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "How do I keep a torch or burner flame on the hot end of a Stirling engine?",
 "tags": [
  "shroud",
  "burner",
  "torch",
  "heat source",
  "flame",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "stirling burner shroud",
  "torch shroud stirling hot end",
  "flame guard hot end",
  "burner cowl 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/tri-clamp-burner-shroud/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-burner-shroud/sheet.txt",
 "sheet": {
  "basis": "Design values from the sealed generator layout: shell 4 mm clear of the optional fin sleeve's Ø80 fins, open bottom over the torch stand, exhaust windows under the lid; ISO 273 medium clearance (Ø4.5) for the M4 foot screws",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A Ø92 / Ø88 shell round the hot end (the cup's closed end, with or without the fin sleeve), from 15 mm below the cup's bottom to 10 mm above the sleeve's top fin. The bottom is open: the torch or burner below fires up into it. A lid closes the top down to Ø54.8, 2 mm clear of the tube, and six 14 × 10 windows under the lid let the gas out sideways once it has passed the fins.",
   "Three 8 × 8 legs stand it on the frame base; each leg's 20 × 12 × 4 foot runs outward and takes an M4 × 10 into a tapped hole in the base, clear of the leg. The shroud touches nothing else: not the head, not the fins, not the torch stand.",
   "The 4 mm annulus between the sleeve's fins and the shell keeps the flame gas against the fins (without the sleeve, against the bare tube). The heat source is the builder's choice: a propane or butane torch head in the torch stand, or a natural-gas or biogas burner that fires into the open bottom."
  ],
  "table": {
   "columns": [
    "feature",
    "value"
   ],
   "rows": [
    [
     "shell",
     "Ø92 / Ø88"
    ],
    [
     "above the base",
     "70 to 138.5"
    ],
    [
     "lid opening",
     "Ø54.8"
    ],
    [
     "exhaust",
     "6 × 14 × 10 under the lid"
    ],
    [
     "legs",
     "3 × 8 × 8 on r 49, feet 20 × 12 × 4, Ø4.5 at r 59"
    ],
    [
     "gap to the fins",
     4
    ]
   ]
  }
 },
 "sheet_text": "Burner shroud for a 2 in tri-clamp hot end — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-burner-shroud/  (CC BY 4.0)\nBasis: Design values from the sealed generator layout: shell 4 mm clear of the optional fin sleeve's Ø80 fins, open bottom over the torch stand, exhaust windows under the lid; ISO 273 medium clearance (Ø4.5) for the M4 foot screws\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A Ø92 / Ø88 shell round the hot end (the cup's closed end, with or without the fin sleeve), from 15 mm below the cup's bottom to 10 mm above the sleeve's top fin. The bottom is open: the torch or burner below fires up into it. A lid closes the top down to Ø54.8, 2 mm clear of the tube, and six 14 × 10 windows under the lid let the gas out sideways once it has passed the fins.\n- Three 8 × 8 legs stand it on the frame base; each leg's 20 × 12 × 4 foot runs outward and takes an M4 × 10 into a tapped hole in the base, clear of the leg. The shroud touches nothing else: not the head, not the fins, not the torch stand.\n- The 4 mm annulus between the sleeve's fins and the shell keeps the flame gas against the fins (without the sleeve, against the bare tube). The heat source is the builder's choice: a propane or butane torch head in the torch stand, or a natural-gas or biogas burner that fires into the open bottom.\n\nfeature  value\nshell  Ø92 / Ø88\nabove the base  70 to 138.5\nlid opening  Ø54.8\nexhaust  6 × 14 × 10 under the lid\nlegs  3 × 8 × 8 on r 49, feet 20 × 12 × 4, Ø4.5 at r 59\ngap to the fins  4.0\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- ISO: ISO 273 clearance holes for bolts and screws (fine / medium / coarse) — standard — dimensions are facts [verify license at link] — https://www.iso.org/standard/4196.html\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/tri-clamp-burner-shroud/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-burner-shroud\n",
 "sources": [
  {
   "publisher": "ISO",
   "title": "ISO 273 clearance holes for bolts and screws (fine / medium / coarse)",
   "url": "https://www.iso.org/standard/4196.html",
   "formats": [
    "standard"
   ],
   "license": "dimensions are facts",
   "license_verified": false,
   "hosted": false
  },
  {
   "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": [
  "tri-clamp-hot-fin-sleeve",
  "tri-clamp-cups",
  "tri-clamp-torch-stand",
  "tri-clamp-sealed-generator-frame",
  "list-tri-clamp-sealed-diaphragm-generator"
 ],
 "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": "shell bore",
   "exact": "Ø88",
   "mates": "fin sleeve fins Ø80 (no contact)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "lid opening",
   "exact": "Ø54.8",
   "mates": "cup tube Ø50.8 (no contact)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "foot holes",
   "exact": "3 × Ø4.5",
   "mates": "M4 clearance (ISO 273 medium)",
   "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": "Does the shroud touch the hot end?",
   "a": "No: 4 mm clear of the fin sleeve radially and 2 mm clear of the tube at the lid. It stands on its own feet."
  },
  {
   "q": "Which heat sources fit?",
   "a": "Anything that fires up into the Ø88 open bottom: a torch head held in the torch stand, or a small gas burner."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "burner-shroud-2in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-burner-shroud/burner-shroud-2in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-burner-shroud/burner-shroud-2in.stl",
   "note": "burner shroud: shell Ø92 / Ø88 from 70 to 138.5 above its feet, lid to Ø54.8, 6 windows 14 × 10 under the lid, 3 legs 8 × 8 on r 49 with 20 × 12 × 4 feet out to r 65, Ø4.5 holes at r 59"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-burner-shroud/index.md"
}