{
 "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-walking-beam-gamma-frame",
 "name": "Frame for the tri-clamp walking-beam gamma",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "What frame holds a tri-clamp walking-beam Stirling?",
 "tags": [
  "frame",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "walking beam 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-walking-beam-gamma-frame/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-walking-beam-gamma-frame/sheet.txt",
 "sheet": {
  "basis": "Design values",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "One base: cradles under the hot spool and the tee, the beam's post, the crank's two uprights and the generator bracket."
  ],
  "table": {
   "columns": [
    "feature",
    "value"
   ],
   "rows": [
    [
     "base",
     "730 × 175 × 8"
    ],
    [
     "run axis",
     "138 above the bench"
    ],
    [
     "pivot",
     "626.4 above the bench"
    ]
   ]
  }
 },
 "sheet_text": "Frame for the tri-clamp walking-beam gamma — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-walking-beam-gamma-frame/  (CC BY 4.0)\nBasis: Design values\nCatalog version: 2026-10-20\n\nSizes: see table below\n- One base: cradles under the hot spool and the tee, the beam's post, the crank's two uprights and the generator bracket.\n\nfeature  value\nbase  730 × 175 × 8\nrun axis  138 above the bench\npivot  626.4 above the bench\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/tri-clamp-walking-beam-gamma-frame/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-walking-beam-gamma-frame\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-tri-clamp-walking-beam-gamma"
 ],
 "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": "crank uprights",
   "exact": "Ø22 × 7 pockets",
   "mates": "608 bearing OD",
   "fit": "press",
   "files": "all"
  },
  {
   "feature": "pivot cheeks",
   "exact": "Ø5",
   "mates": "Ø5 dowel pivot pin",
   "fit": "press",
   "files": "all"
  },
  {
   "feature": "cradles",
   "exact": "Ø50.8 seats",
   "mates": "hot-spool and tee OD",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "tapped holes",
   "exact": "M4 Ø3.3, M3 bracket Ø3.4 + 90° countersink",
   "mates": "torch stand, shroud, generator",
   "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": "How tall is it?",
   "a": "The beam pivot is 626 mm above the bench: the 6 in bounce spool sits under the piston-rod gland."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "walking-beam-gamma-frame-2in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-walking-beam-gamma-frame/walking-beam-gamma-frame-2in.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-walking-beam-gamma-frame/walking-beam-gamma-frame-2in.stl",
   "note": "walking-beam gamma frame: base 730 × 175 × 8, two cradles, beam post with cheeks (Ø5 pivot holes), two crank uprights with 608 pockets, generator bracket, torch-stand and shroud holes (M4 tapped)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-walking-beam-gamma-frame/index.md"
}