{
 "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": "list-gamma-2in-tri-clamp",
 "name": "Build list: Gamma Stirling, 2 in tri-clamp",
 "kind": "list",
 "category": "Stirling engines",
 "group": "Guide",
 "year": null,
 "question": "What parts do I need to build a Gamma Stirling, 2 in tri-clamp?",
 "tags": [
  "list",
  "build",
  "stirling",
  "gamma",
  "long earth society"
 ],
 "aliases": [
  "gamma stirling, 2 in tri-clamp",
  "stirling engine parts list",
  "what do i need to build a stirling engine"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": true,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/list-gamma-2in-tri-clamp/",
 "sheet_txt": "https://xemstudio.com/objects/list-gamma-2in-tri-clamp/sheet.txt",
 "sheet": {
  "basis": "Every printed part is a free file on this site; bought items named with quantities",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "The Long Earth Society engine: hot spool, shell displacer, graphite or syringe piston, counterweighted crank, Ø100 flywheel.",
   "Numbers: Ø46 × 90 displacer at 20 mm stroke · Ø20 piston at 12 mm · ratio ~9 · 200–500 rpm on a tea light · 0.1–0.5 W"
  ],
  "table": {
   "columns": [
    "subsystem",
    "object",
    "parts",
    "qty",
    "print_or_buy",
    "note"
   ],
   "rows": [
    [
     "Hot end",
     "tri-clamp-end-cap",
     "tc-cap-2in-flat",
     1,
     "print",
     "flame side"
    ],
    [
     "Cylinder",
     "tri-clamp-spool",
     "tc-spool-2in-6in",
     1,
     "buy",
     "buy the stainless spool; print to check"
    ],
    [
     "Joints",
     "tri-clamp-end-cap",
     "tc-gasket-2in",
     2,
     "buy",
     "ISO 2852 Type B gaskets on the cold joints"
    ],
    [
     "Clamps",
     "tri-clamp-clamps",
     "clamp-half-2in",
     4,
     "print",
     "two halves per joint; stainless clamp at the flame side"
    ],
    [
     "Hot joint",
     "tri-clamp-clamps",
     "hot-gasket-template-2in, heat-shield-2in",
     1,
     "print",
     "trace on 0.5 mm graphite / mica sheet for the flame-side joint"
    ],
    [
     "Displacer",
     "tri-clamp-displacers-and-heads",
     "displacer-shell-2in-90, displacer-cap-2in",
     1,
     "print",
     "0.75 mm gap, 20 mm stroke"
    ],
    [
     "Regenerator",
     "regenerator-and-heat-materials",
     "regenerator-cage-47-5x40",
     1,
     "print",
     "pack with #100 stainless mesh"
    ],
    [
     "Displacer rod",
     "stirling-shafts-and-rods",
     "rod-3x150",
     1,
     "print",
     "cut to length; Ø3 music wire or drill rod for a running engine (it slides)"
    ],
    [
     "Rod guide",
     "brass-tube-ks",
     "brass-4mm",
     1,
     "buy",
     "K&S 4 mm brass (3.1 ID) for the Ø3 rod; press in the head, 20–30 mm proud"
    ],
    [
     "Cold head",
     "tri-clamp-displacers-and-heads",
     "head-displacer-2in",
     1,
     "print",
     "guide bore + 4 mm barb; or head-crank-2in"
    ],
    [
     "Transfer",
     "silicone-tube-and-fittings",
     "silicone-tube-4x6-50, barb-4mm",
     1,
     "print",
     "keep under 30 mm"
    ],
    [
     "Power cylinder",
     "power-cylinder-piston-crosshead",
     "liner-20x45-flanged, piston-20x18-blank",
     1,
     "print",
     "lap to fit, or graphite piston in a Ø20 glass tube, or syringe-10ml"
    ],
    [
     "Crosshead",
     "power-cylinder-piston-crosshead",
     "crosshead-8mm-rod3, crosshead-guide-8mm, wrist-pin-3x16",
     1,
     "print",
     "recommended with a lapped piston"
    ],
    [
     "Base plate",
     "gamma-base-plate-and-beam",
     "base-plate-2in",
     1,
     "print",
     "4 × M5 to 2020 or a board"
    ],
    [
     "Crank stands",
     "stirling-linkage-fittings",
     "crank-stand-625-h60",
     2,
     "print",
     "625 pockets for the Ø5 crankshaft; slotted feet match the base plate"
    ],
    [
     "Bearings",
     "ball-bearings-metric",
     "bearing-623, bearing-625",
     6,
     "buy",
     "4 × 623 in the con-rods, 2 × 625 on the shaft"
    ],
    [
     "Crankshaft",
     "stirling-shafts-and-rods",
     "crankshaft-5x100-dflat",
     1,
     "print",
     "print flat side down, 100 % infill; or Ø5 steel"
    ],
    [
     "Spacers",
     "stirling-shafts-and-rods",
     "spacer-5mm-t1, spacer-5mm-t2",
     4,
     "print",
     "set the 1 mm gaps along the crankshaft"
    ],
    [
     "Crank discs",
     "counterweighted-cranks",
     "cw-crank-disc-stroke20, cw-crank-disc-stroke15",
     2,
     "print",
     "90° apart, displacer leads"
    ],
    [
     "Crank pins",
     "dowel-pins-metric",
     "dowel-3x12",
     2,
     "buy",
     "press fit"
    ],
    [
     "Rod clevis",
     "stirling-linkage-fittings",
     "rod-clevis-3mm",
     1,
     "print",
     "grub on the Ø3 displacer rod; conrod-50's 623 end on its Ø3 pin"
    ],
    [
     "Con-rods",
     "crank-conrod-flywheel-kit",
     "conrod-50, conrod-40",
     2,
     "print",
     "50 displacer, 40 piston"
    ],
    [
     "Flywheel",
     "nut-weighted-flywheels",
     "flywheel-150-m10-b5",
     1,
     "print",
     "press in 18 M10 nuts (or fewer)"
    ],
    [
     "Flywheel nuts",
     "hex-nuts-metric",
     "",
     18,
     "buy",
     "18 × M10 hex nuts (ISO 4032: 16 AF × 8.4), or 12 × M12 / 1/2 in on the Ø150 M12 wheel"
    ],
    [
     "Collars / clips",
     "shaft-collars-clips-and-shafts",
     "collar-5mm",
     2,
     "buy",
     "locate the crankshaft"
    ],
    [
     "Fasteners",
     "socket-head-cap-screws-metric",
     "shcs-m3x8, shcs-m3x10, shcs-m3x16",
     20,
     "buy",
     "+ M3 nuts, M5 × 10 button heads, inserts"
    ],
    [
     "Heat",
     "tea-light-candles",
     "tea-light-38x16",
     1,
     "buy",
     "15–20 mm below the cap"
    ],
    [
     "Instruments",
     "instrument-mounts",
     "probe-clamp-k-type-3mm, probe-clamp-ds18b20-6mm, hall-sensor-mount-to92",
     3,
     "print",
     "optional"
    ],
    [
     "Calibrate first",
     "printer-calibration-coupons",
     "hole-gauge-m3-2-8-to-3-6, pin-gauge-2-8-to-3-2, bearing-pocket-gauge-623-625-608",
     1,
     "print",
     "once per printer"
    ]
   ]
  }
 },
 "sheet_text": "Build list: Gamma Stirling, 2 in tri-clamp — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/list-gamma-2in-tri-clamp/  (CC BY 4.0)\nBasis: Every printed part is a free file on this site; bought items named with quantities\nCatalog version: 2026-10-20\n\nSizes: see table below\n- The Long Earth Society engine: hot spool, shell displacer, graphite or syringe piston, counterweighted crank, Ø100 flywheel.\n- Numbers: Ø46 × 90 displacer at 20 mm stroke · Ø20 piston at 12 mm · ratio ~9 · 200–500 rpm on a tea light · 0.1–0.5 W\n\nsubsystem  object  parts  qty  print_or_buy  note\nHot end  tri-clamp-end-cap  tc-cap-2in-flat  1  print  flame side\nCylinder  tri-clamp-spool  tc-spool-2in-6in  1  buy  buy the stainless spool; print to check\nJoints  tri-clamp-end-cap  tc-gasket-2in  2  buy  ISO 2852 Type B gaskets on the cold joints\nClamps  tri-clamp-clamps  clamp-half-2in  4  print  two halves per joint; stainless clamp at the flame side\nHot joint  tri-clamp-clamps  hot-gasket-template-2in, heat-shield-2in  1  print  trace on 0.5 mm graphite / mica sheet for the flame-side joint\nDisplacer  tri-clamp-displacers-and-heads  displacer-shell-2in-90, displacer-cap-2in  1  print  0.75 mm gap, 20 mm stroke\nRegenerator  regenerator-and-heat-materials  regenerator-cage-47-5x40  1  print  pack with #100 stainless mesh\nDisplacer rod  stirling-shafts-and-rods  rod-3x150  1  print  cut to length; Ø3 music wire or drill rod for a running engine (it slides)\nRod guide  brass-tube-ks  brass-4mm  1  buy  K&S 4 mm brass (3.1 ID) for the Ø3 rod; press in the head, 20–30 mm proud\nCold head  tri-clamp-displacers-and-heads  head-displacer-2in  1  print  guide bore + 4 mm barb; or head-crank-2in\nTransfer  silicone-tube-and-fittings  silicone-tube-4x6-50, barb-4mm  1  print  keep under 30 mm\nPower cylinder  power-cylinder-piston-crosshead  liner-20x45-flanged, piston-20x18-blank  1  print  lap to fit, or graphite piston in a Ø20 glass tube, or syringe-10ml\nCrosshead  power-cylinder-piston-crosshead  crosshead-8mm-rod3, crosshead-guide-8mm, wrist-pin-3x16  1  print  recommended with a lapped piston\nBase plate  gamma-base-plate-and-beam  base-plate-2in  1  print  4 × M5 to 2020 or a board\nCrank stands  stirling-linkage-fittings  crank-stand-625-h60  2  print  625 pockets for the Ø5 crankshaft; slotted feet match the base plate\nBearings  ball-bearings-metric  bearing-623, bearing-625  6  buy  4 × 623 in the con-rods, 2 × 625 on the shaft\nCrankshaft  stirling-shafts-and-rods  crankshaft-5x100-dflat  1  print  print flat side down, 100 % infill; or Ø5 steel\nSpacers  stirling-shafts-and-rods  spacer-5mm-t1, spacer-5mm-t2  4  print  set the 1 mm gaps along the crankshaft\nCrank discs  counterweighted-cranks  cw-crank-disc-stroke20, cw-crank-disc-stroke15  2  print  90° apart, displacer leads\nCrank pins  dowel-pins-metric  dowel-3x12  2  buy  press fit\nRod clevis  stirling-linkage-fittings  rod-clevis-3mm  1  print  grub on the Ø3 displacer rod; conrod-50's 623 end on its Ø3 pin\nCon-rods  crank-conrod-flywheel-kit  conrod-50, conrod-40  2  print  50 displacer, 40 piston\nFlywheel  nut-weighted-flywheels  flywheel-150-m10-b5  1  print  press in 18 M10 nuts (or fewer)\nFlywheel nuts  hex-nuts-metric    18  buy  18 × M10 hex nuts (ISO 4032: 16 AF × 8.4), or 12 × M12 / 1/2 in on the Ø150 M12 wheel\nCollars / clips  shaft-collars-clips-and-shafts  collar-5mm  2  buy  locate the crankshaft\nFasteners  socket-head-cap-screws-metric  shcs-m3x8, shcs-m3x10, shcs-m3x16  20  buy  + M3 nuts, M5 × 10 button heads, inserts\nHeat  tea-light-candles  tea-light-38x16  1  buy  15–20 mm below the cap\nInstruments  instrument-mounts  probe-clamp-k-type-3mm, probe-clamp-ds18b20-6mm, hall-sensor-mount-to92  3  print  optional\nCalibrate first  printer-calibration-coupons  hole-gauge-m3-2-8-to-3-6, pin-gauge-2-8-to-3-2, bearing-pocket-gauge-623-625-608  1  print  once per printer\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\nXem Studio scan: not planned; the official CAD above covers it.\nAPI: https://xemstudio.com/api/geometry?object=list-gamma-2in-tri-clamp\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": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "tri-clamp-end-cap",
  "tri-clamp-spool",
  "tri-clamp-clamps",
  "tri-clamp-displacers-and-heads",
  "regenerator-and-heat-materials",
  "stirling-shafts-and-rods",
  "brass-tube-ks",
  "silicone-tube-and-fittings",
  "power-cylinder-piston-crosshead",
  "gamma-base-plate-and-beam",
  "stirling-linkage-fittings",
  "ball-bearings-metric"
 ],
 "fits": [],
 "faq": [
  {
   "q": "What parts do I need to build a Gamma Stirling, 2 in tri-clamp?",
   "a": "33 printed parts (all free here) and 9 bought items; see the table and build order on this page."
  },
  {
   "q": "How do I download every STL for this build at once?",
   "a": "The stl-list.txt on this page lists every printed part's STL URL; paste it into a download script or your slicer's import."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/list-gamma-2in-tri-clamp/index.md"
}