{
 "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-torch-stand",
 "name": "Torch stand for a horizontal tri-clamp hot leg",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "How do I hold a torch under a Stirling engine's hot end?",
 "tags": [
  "torch",
  "burner",
  "stand",
  "heat source",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "stirling torch stand",
  "burner holder stirling engine",
  "torch holder for a stirling engine"
 ],
 "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-torch-stand/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-torch-stand/sheet.txt",
 "sheet": {
  "basis": "Design values; ISO 273 clearance for the M4 foot screws",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A foot, a post and a ring: the torch head goes up through the Ø32 ring and three M4 set screws centre it, so the flame points straight up at the middle of the hot leg.",
   "The post stands to one side so the space under the ring is open. The foot bolts to the engine frame with two M4 screws."
  ],
  "table": {
   "columns": [
    "part",
    "size_mm"
   ],
   "rows": [
    [
     "foot",
     "70 × 40 × 5"
    ],
    [
     "ring",
     "Ø48 / Ø32 × 14"
    ],
    [
     "ring top above foot",
     40
    ]
   ]
  }
 },
 "sheet_text": "Torch stand for a horizontal tri-clamp hot leg — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-torch-stand/  (CC BY 4.0)\nBasis: Design values; ISO 273 clearance for the M4 foot screws\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A foot, a post and a ring: the torch head goes up through the Ø32 ring and three M4 set screws centre it, so the flame points straight up at the middle of the hot leg.\n- The post stands to one side so the space under the ring is open. The foot bolts to the engine frame with two M4 screws.\n\npart  size_mm\nfoot  70 × 40 × 5\nring  Ø48 / Ø32 × 14\nring top above foot  40\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-torch-stand/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-torch-stand\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": [
  "list-tri-clamp-elbow-diaphragm-alpha",
  "tri-clamp-diaphragm-alpha-frame"
 ],
 "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": "ring bore",
   "exact": "Ø32",
   "mates": "torch head (centred by the set screws)",
   "fit": "designed",
   "files": "torch-stand-"
  },
  {
   "feature": "set-screw holes",
   "exact": "3 × Ø3.3",
   "mates": "M4 tap drill",
   "fit": "designed",
   "files": "torch-stand-"
  },
  {
   "feature": "foot holes",
   "exact": "2 × Ø4.5",
   "mates": "M4 clearance (ISO 273 medium)",
   "fit": "designed",
   "files": "torch-stand-"
  }
 ],
 "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": "What torch fits?",
   "a": "Any torch head that passes the Ø32 ring; the three set screws centre it."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "torch-stand-40",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-torch-stand/torch-stand-40.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-torch-stand/torch-stand-40.stl",
   "note": "torch stand: foot 70 × 40 × 5 with 2 × Ø4.5 at ±25, post 14 × 14, ring Ø48 / Ø32 × 14, ring top 40 above the foot, 3 × M4 tapped (Ø3.3) at 120°"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-torch-stand/index.md"
}