{
 "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-cross-engine-frame",
 "name": "Frame for the 2 in tri-clamp cross diaphragm gamma",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "What holds the tri-clamp cross diaphragm gamma on the bench?",
 "tags": [
  "frame",
  "gamma",
  "cross",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "tri clamp cross engine frame",
  "stirling frame tri clamp"
 ],
 "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-cross-engine-frame/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-cross-engine-frame/sheet.txt",
 "sheet": {
  "basis": "Positions from the engine layout (tools/gen_cross_engine.py cross_layout); ISO 273 medium clearance for M5; Ø3.3 for an M4 thread",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "One piece: a base plate with the torch stand on it, and a wall behind the engine. The 2 in spool hanger clamps the cross's lower run and its bar bolts to the wall with two M5 × 25 and nuts, so the whole engine hangs over the flame.",
   "A window in the wall leaves room for the jacket's fill port and the heat shield."
  ],
  "table": {
   "columns": [
    "feature",
    "value"
   ],
   "rows": [
    [
     "base",
     "140 × 150 × 8"
    ],
    [
     "wall",
     "124 × 10, top 227.5"
    ],
    [
     "hanger screws",
     "2 × Ø5.5 at x ±39.4, z 213.5"
    ],
    [
     "torch stand",
     "2 × Ø3.3 at x ±25, y 28"
    ]
   ]
  }
 },
 "sheet_text": "Frame for the 2 in tri-clamp cross diaphragm gamma — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-cross-engine-frame/  (CC BY 4.0)\nBasis: Positions from the engine layout (tools/gen_cross_engine.py cross_layout); ISO 273 medium clearance for M5; Ø3.3 for an M4 thread\nCatalog version: 2026-10-20\n\nSizes: see table below\n- One piece: a base plate with the torch stand on it, and a wall behind the engine. The 2 in spool hanger clamps the cross's lower run and its bar bolts to the wall with two M5 × 25 and nuts, so the whole engine hangs over the flame.\n- A window in the wall leaves room for the jacket's fill port and the heat shield.\n\nfeature  value\nbase  140 × 150 × 8\nwall  124 × 10, top 227.5\nhanger screws  2 × Ø5.5 at x ±39.4, z 213.5\ntorch stand  2 × Ø3.3 at x ±25, y 28\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-cross-engine-frame/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-cross-engine-frame\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-cross-diaphragm-gamma",
  "spool-hanger-collars",
  "tri-clamp-torch-stand"
 ],
 "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": "hanger holes",
   "exact": "2 × Ø5.5",
   "mates": "M5 clearance (ISO 273 medium)",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "torch-stand holes",
   "exact": "2 × Ø3.3 (M4 tapped)",
   "mates": "shcs-m4x10",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "wall face",
   "exact": "flat, 39.4 from the run axis",
   "mates": "spool hanger bar",
   "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": "What does the frame carry?",
   "a": "The torch stand on the base and the engine on the spool hanger at the wall."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "cross-engine-frame-2in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-cross-engine-frame/cross-engine-frame-2in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-cross-engine-frame/cross-engine-frame-2in.stl",
   "note": "frame: base 140 × 150 × 8, wall 124 × 10 to 227.5 with a 60 wide window, 2 gussets, 2 × Ø5.5 for the spool hanger at 213.5, 2 × Ø3.3 (M4 thread) for the torch stand"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-cross-engine-frame/index.md"
}