{
 "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-diaphragm-alpha-frame",
 "name": "Frame for the 2 in tri-clamp elbow diaphragm alpha",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "What holds the tri-clamp elbow diaphragm alpha together?",
 "tags": [
  "frame",
  "alpha",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "tri clamp alpha frame",
  "diaphragm stirling frame"
 ],
 "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-diaphragm-alpha-frame/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-diaphragm-alpha-frame/sheet.txt",
 "sheet": {
  "basis": "Positions from the engine layout (tools/gen_diaphragm.py alpha_layout); the feet seats are cut by the fittings' own outer surfaces",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "One piece: a base plate, a foot under the elbow (its seat is the elbow's outer surface) that carries the cold leg, a foot under the capped run of the hot tee, and a diagonal strut from the base up to a bearing block with two 625 pockets at the crank.",
   "The strut runs 40–56 mm behind the plane of the legs, clear of every clamp and of the flywheel."
  ],
  "table": {
   "columns": [
    "feature",
    "value"
   ],
   "rows": [
    [
     "base",
     "430 × 130 × 8"
    ],
    [
     "crank above elbow centre",
     "257.4, 257.4"
    ],
    [
     "bearings",
     "2 × 625"
    ]
   ]
  }
 },
 "sheet_text": "Frame for the 2 in tri-clamp elbow diaphragm alpha — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-diaphragm-alpha-frame/  (CC BY 4.0)\nBasis: Positions from the engine layout (tools/gen_diaphragm.py alpha_layout); the feet seats are cut by the fittings' own outer surfaces\nCatalog version: 2026-10-20\n\nSizes: see table below\n- One piece: a base plate, a foot under the elbow (its seat is the elbow's outer surface) that carries the cold leg, a foot under the capped run of the hot tee, and a diagonal strut from the base up to a bearing block with two 625 pockets at the crank.\n- The strut runs 40–56 mm behind the plane of the legs, clear of every clamp and of the flywheel.\n\nfeature  value\nbase  430 × 130 × 8\ncrank above elbow centre  257.4, 257.4\nbearings  2 × 625\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-diaphragm-alpha-frame/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-diaphragm-alpha-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-elbow-diaphragm-alpha"
 ],
 "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": "bearing pockets",
   "exact": "Ø16 × 5",
   "mates": "625 bearing",
   "fit": "press",
   "files": "alpha-frame-"
  },
  {
   "feature": "shaft passage",
   "exact": "Ø11.2",
   "mates": "Ø5 crankshaft (no contact)",
   "fit": "designed",
   "files": "alpha-frame-"
  },
  {
   "feature": "foot seats",
   "exact": "Ø50.8 (tube OD), elbow outer surface",
   "mates": "2 in elbow and tee",
   "fit": "designed",
   "files": "alpha-frame-"
  },
  {
   "feature": "torch-stand holes",
   "exact": "Ø4.5",
   "mates": "M4 clearance (ISO 273 medium)",
   "fit": "designed",
   "files": "alpha-frame-"
  }
 ],
 "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": "Both legs (two feet), the crankshaft bearings (strut block) and the torch stand (two M4 holes)."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "alpha-frame-2in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-diaphragm-alpha-frame/alpha-frame-2in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-diaphragm-alpha-frame/alpha-frame-2in.stl",
   "note": "frame for the 2 in elbow diaphragm alpha: base 430 × 130 × 8, feet under the elbow and the hot tee, diagonal strut to a bearing block with two 625 pockets at the crank (257.4, 257.4) from the elbow centre"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-diaphragm-alpha-frame/index.md"
}