{
 "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-tri-clamp-horizontal-gamma",
 "name": "Build list: Tri-clamp horizontal gamma generator, 2 in, chargeable",
 "kind": "list",
 "category": "Stirling engines",
 "group": "Guide",
 "year": null,
 "question": "What parts do I need to build a Tri-clamp horizontal gamma generator, 2 in, chargeable?",
 "tags": [
  "list",
  "build",
  "stirling",
  "long earth society",
  "tri-clamp",
  "diaphragm",
  "gamma",
  "horizontal",
  "piston",
  "pressurised",
  "generator",
  "torch"
 ],
 "aliases": [
  "stirling generator tri clamp",
  "horizontal stirling engine tri clamp",
  "two cylinder gamma stirling",
  "pressurised stirling tri clamp",
  "stirling engine build list"
 ],
 "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-tri-clamp-horizontal-gamma/",
 "sheet_txt": "https://xemstudio.com/objects/list-tri-clamp-horizontal-gamma/sheet.txt",
 "sheet": {
  "basis": "Every part is a free STEP/STL on this site or a standard part with its own page; quantities are the full count, every screw, nut, pin, gasket and clamp.",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "The classic desk Stirling generator in tri-clamp, built for power: a horizontal closed hot spool over the burner, a bored and honed power spool beside it, both rods to one ball-bearing crank on a pair of posts with a Ø200 flywheel, and a gimbal-motor generator belted off the crank.",
   "Numbers: Displacer Ø40 × 30 (37.7 mL) · piston Ø48 × 36 (65.1 mL) · 90° · dead 84.5 mL (swept/dead 0.77) · hot wall 500 °C, water-cooled · model shaft power: air 1 atm 2–4 W at 600 rpm; charged 5 bar gauge: air 5–29 W at 600 rpm, helium 13–61 W at 1200 rpm · 2208 generator 6 : 1 by belt: 0.0–3.6 W at 26–28 V at 1 atm"
  ],
  "table": {
   "columns": [
    "subsystem",
    "object",
    "parts",
    "qty",
    "note"
   ],
   "rows": [
    [
     null,
     "tri-clamp-horizontal-gamma-frame",
     "horizontal-gamma-frame-2in",
     1,
     "base, cradle, pedestals, guide, crank uprights"
    ],
    [
     null,
     "tri-clamp-torch-stand",
     "torch-stand-40",
     1,
     "under the shroud's inlet, post toward −Y"
    ],
    [
     null,
     "set-screws-metric",
     "set-m4x10",
     3,
     "centre the torch head in the stand ring"
    ],
    [
     null,
     "socket-head-cap-screws-metric",
     "shcs-m4x10",
     4,
     "torch stand (2), shroud feet (2)"
    ],
    [
     null,
     "tri-clamp-horizontal-burner-shroud",
     "burner-shroud-2in-horizontal",
     1,
     "round the fins"
    ],
    [
     null,
     "tri-clamp-closed-hot-spool-bored",
     "hot-spool-2in-152.4-closed-bored-48.00",
     1,
     "the displacer cylinder: lying along −X"
    ],
    [
     null,
     "tri-clamp-ring-fin-sleeve",
     "fin-sleeve-2in-9x76",
     1,
     "optional heat exchanger: slid over the closed end"
    ],
    [
     null,
     "tri-clamp-flow-water-jacket",
     "water-jacket-half-2in-48-flow",
     2,
     "optional heat exchanger: round the cold end over the cooler zone, hose spigots up and down"
    ],
    [
     null,
     "socket-head-cap-screws-metric",
     "shcs-m4x25",
     4,
     "optional: water-jacket ears"
    ],
    [
     null,
     "hex-nuts-metric",
     "nut-m4",
     4,
     "optional: water-jacket ears"
    ],
    [
     null,
     "stirling-annular-screen-stack",
     "screen-stack-48x42x40-50mesh",
     1,
     "optional heat exchanger (with the liner): on the liner's neck"
    ],
    [
     null,
     "stirling-slotted-regenerator-liner",
     "liner-2in-slotted-48-40",
     1,
     "optional heat exchanger (internal insert), pressed into the hot spool: without it the displacer runs in the Ø48.00 bore 4 mm clear, a plain annular-gap engine with far less power"
    ],
    [
     null,
     "stirling-clearance-seal-displacer",
     "displacer-shell-38.5x98",
     1,
     "the shell"
    ],
    [
     null,
     "stirling-clearance-seal-displacer",
     "displacer-cap-40-land",
     1,
     "pressed into the shell; land in the liner bore"
    ],
    [
     null,
     "stirling-precision-rods",
     "rod-6x423.2-m6",
     1,
     "displacer rod: cap to the displacer yoke"
    ],
    [
     null,
     "hex-nuts-metric",
     "nut-m6",
     2,
     "lock nuts: displacer cold face, under the displacer yoke"
    ],
    [
     null,
     "tri-clamp-transfer-cap",
     "transfer-cap-2in-rod6",
     1,
     "on the hot spool: displacer-rod gland, transfer boss +Y, gauge on top, relief below"
    ],
    [
     null,
     "tri-clamp-transfer-cap",
     "transfer-cap-2in-blind",
     1,
     "on the power spool's head end: transfer boss −Y, fill on top, plug below"
    ],
    [
     null,
     "sleeve-bushings",
     "bushing-6x10x10",
     3,
     "displacer-rod gland (2), guide block (1)"
    ],
    [
     null,
     "high-pressure-sanitary-clamps",
     "hp-clamp-2in",
     4,
     "rating above the 7 bar gauge relief setting (not drawn here)"
    ],
    [
     null,
     "tri-clamp-gasket",
     "tc-gasket-2in",
     4,
     "hot spool–cap, cap–power spool, power–bounce spool, bounce spool–gland cap"
    ],
    [
     null,
     "stirling-precision-rods",
     "transfer-tube-12.7x0.89x64",
     1,
     "transfer tube between the two 1/2 NPT fittings"
    ],
    [
     null,
     "npt-thread-envelopes",
     "npt-1-2-male",
     2,
     "1/2 NPT × 1/2 in tube fittings in the transfer bosses (bodies are the builder's choice)"
    ],
    [
     null,
     "tri-clamp-spool-bored-honed",
     "spool-2in-3in-bored-48.00",
     1,
     "power cylinder"
    ],
    [
     null,
     "stirling-clearance-seal-pistons",
     "piston-48-gamma-m8",
     1,
     "Ø48.00, rod side toward the crank"
    ],
    [
     null,
     "stirling-precision-rods",
     "rod-8x304.85-m8",
     1,
     "piston rod"
    ],
    [
     null,
     "hex-nuts-metric",
     "nut-m8",
     2,
     "lock nuts: piston boss, under the power yoke"
    ],
    [
     null,
     "tri-clamp-spool-npt-bosses",
     "spool-2in-6in-3x-npt14",
     1,
     "bounce space: fill on top, gauge and relief at 30° / 150°"
    ],
    [
     null,
     "tri-clamp-rod-gland-cap",
     "gland-cap-2in-2x-8x12x20",
     1,
     "closes the bounce spool; the piston rod's gland and guide"
    ],
    [
     null,
     "sleeve-bushings",
     "bushing-8x12x20",
     2,
     "in the gland cap"
    ],
    [
     null,
     "npt-thread-envelopes",
     "npt-1-4-male",
     7,
     "1/4 NPT stems: working-space gauge, relief, fill and plug; bounce-space fill, gauge and relief (bodies are the builder's choice)"
    ],
    [
     null,
     "stirling-crosshead-yokes",
     "yoke-rod6-m6",
     1,
     "displacer yoke, stub pin toward +Y"
    ],
    [
     null,
     "stirling-crosshead-yokes",
     "yoke-rod8-m8",
     1,
     "power yoke, stub pin toward −Y"
    ],
    [
     null,
     "dowel-pins-metric",
     "dowel-5x20",
     2,
     "stub wrist pins"
    ],
    [
     null,
     "shaft-collars",
     "collar-5mm",
     2,
     "on the wrist pins"
    ],
    [
     null,
     "set-screws-metric",
     "set-m3x4",
     2,
     "wrist-pin collars"
    ],
    [
     null,
     "stirling-conrods-626-625",
     "conrod-626-625-100",
     2,
     "displacer and power"
    ],
    [
     null,
     "ball-bearings-metric",
     "bearing-626",
     2,
     "big ends"
    ],
    [
     null,
     "ball-bearings-metric",
     "bearing-625",
     2,
     "small ends"
    ],
    [
     null,
     "stirling-built-up-crank-webs",
     "crank-web-56x10-r15",
     1,
     "displacer throw, outer"
    ],
    [
     null,
     "stirling-built-up-crank-webs",
     "crank-web-56x11-r15",
     1,
     "displacer throw, inner"
    ],
    [
     null,
     "stirling-built-up-crank-webs",
     "crank-web-56x11-r18",
     1,
     "power throw, inner"
    ],
    [
     null,
     "stirling-built-up-crank-webs",
     "crank-web-56x10-r18",
     1,
     "power throw, outer"
    ],
    [
     null,
     "dowel-pins-metric",
     "dowel-6x30",
     2,
     "crank pins (r 15 displacer, r 18 power, 90° apart)"
    ],
    [
     null,
     "stirling-precision-rods",
     "shaft-8x56.5",
     1,
     "crank stub, −Y bearing"
    ],
    [
     null,
     "stirling-precision-rods",
     "shaft-8x88",
     1,
     "crank centre shaft"
    ],
    [
     null,
     "stirling-precision-rods",
     "shaft-8x46.3",
     1,
     "crank stub, +Y bearing and flywheel"
    ],
    [
     null,
     "ball-bearings-metric",
     "bearing-608",
     2,
     "crank uprights"
    ],
    [
     null,
     "shaft-collars",
     "collar-8mm",
     2,
     "inside the uprights: axial location"
    ],
    [
     null,
     "set-screws-metric",
     "set-m4x4",
     2,
     "8 mm collars"
    ],
    [
     null,
     "nut-pocket-flywheels",
     "flywheel-200-m12-b8",
     1,
     "outboard of the +Y upright"
    ],
    [
     null,
     "hex-nut-weights",
     "nut-m12",
     18,
     "one in each rim pocket"
    ],
    [
     null,
     "set-screws-metric",
     "set-m3x6",
     1,
     "flywheel hub"
    ],
    [
     null,
     "spool-hanger-collars",
     "hanger-2in-tab",
     2,
     "power spool and bounce spool, bar down on the pedestals"
    ],
    [
     null,
     "spool-hanger-collars",
     "hanger-2in-plain",
     2,
     "close the hangers"
    ],
    [
     null,
     "socket-head-cap-screws-metric",
     "shcs-m4x20",
     4,
     "hanger ears"
    ],
    [
     null,
     "hex-nuts-metric",
     "nut-m4",
     4,
     "hanger ears"
    ],
    [
     null,
     "socket-head-cap-screws-metric",
     "shcs-m5x20",
     4,
     "hanger bars into the pedestals"
    ],
    [
     null,
     "round-belt-generator-drive",
     "crank-pulley-84-b8",
     1,
     "on the crankshaft's free end"
    ],
    [
     null,
     "set-screws-metric",
     "set-m4x6",
     1,
     "crank-pulley hub"
    ],
    [
     null,
     "gimbal-motor-2208-envelope",
     "gimbal-motor-2208-envelope",
     1,
     "the generator: 2208 gimbal outrunner, KV 128, 14.4 Ω (envelope at its published size)"
    ],
    [
     null,
     "countersunk-screws-metric",
     "csk-m3x6",
     4,
     "motor base to the bracket, heads flush"
    ],
    [
     null,
     "round-belt-generator-drive",
     "generator-pulley-2208-pd13.33",
     1,
     "on the motor's rotor top"
    ],
    [
     null,
     "socket-head-cap-screws-metric",
     "shcs-m2x6",
     4,
     "generator pulley to the rotor top"
    ],
    [
     null,
     "round-belt-generator-drive",
     "round-belt-5-c90",
     1,
     "drawn on its pitch line)"
    ]
   ]
  }
 },
 "sheet_text": "Build list: Tri-clamp horizontal gamma generator, 2 in, chargeable — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/list-tri-clamp-horizontal-gamma/  (CC BY 4.0)\nBasis: Every part is a free STEP/STL on this site or a standard part with its own page; quantities are the full count, every screw, nut, pin, gasket and clamp.\nCatalog version: 2026-10-20\n\nSizes: see table below\n- The classic desk Stirling generator in tri-clamp, built for power: a horizontal closed hot spool over the burner, a bored and honed power spool beside it, both rods to one ball-bearing crank on a pair of posts with a Ø200 flywheel, and a gimbal-motor generator belted off the crank.\n- Numbers: Displacer Ø40 × 30 (37.7 mL) · piston Ø48 × 36 (65.1 mL) · 90° · dead 84.5 mL (swept/dead 0.77) · hot wall 500 °C, water-cooled · model shaft power: air 1 atm 2–4 W at 600 rpm; charged 5 bar gauge: air 5–29 W at 600 rpm, helium 13–61 W at 1200 rpm · 2208 generator 6 : 1 by belt: 0.0–3.6 W at 26–28 V at 1 atm\n\nsubsystem  object  parts  qty  note\nNone  tri-clamp-horizontal-gamma-frame  horizontal-gamma-frame-2in  1  base, cradle, pedestals, guide, crank uprights\nNone  tri-clamp-torch-stand  torch-stand-40  1  under the shroud's inlet, post toward −Y\nNone  set-screws-metric  set-m4x10  3  centre the torch head in the stand ring\nNone  socket-head-cap-screws-metric  shcs-m4x10  4  torch stand (2), shroud feet (2)\nNone  tri-clamp-horizontal-burner-shroud  burner-shroud-2in-horizontal  1  round the fins\nNone  tri-clamp-closed-hot-spool-bored  hot-spool-2in-152.4-closed-bored-48.00  1  the displacer cylinder: lying along −X\nNone  tri-clamp-ring-fin-sleeve  fin-sleeve-2in-9x76  1  optional heat exchanger: slid over the closed end\nNone  tri-clamp-flow-water-jacket  water-jacket-half-2in-48-flow  2  optional heat exchanger: round the cold end over the cooler zone, hose spigots up and down\nNone  socket-head-cap-screws-metric  shcs-m4x25  4  optional: water-jacket ears\nNone  hex-nuts-metric  nut-m4  4  optional: water-jacket ears\nNone  stirling-annular-screen-stack  screen-stack-48x42x40-50mesh  1  optional heat exchanger (with the liner): on the liner's neck\nNone  stirling-slotted-regenerator-liner  liner-2in-slotted-48-40  1  optional heat exchanger (internal insert), pressed into the hot spool: without it the displacer runs in the Ø48.00 bore 4 mm clear, a plain annular-gap engine with far less power\nNone  stirling-clearance-seal-displacer  displacer-shell-38.5x98  1  the shell\nNone  stirling-clearance-seal-displacer  displacer-cap-40-land  1  pressed into the shell; land in the liner bore\nNone  stirling-precision-rods  rod-6x423.2-m6  1  displacer rod: cap to the displacer yoke\nNone  hex-nuts-metric  nut-m6  2  lock nuts: displacer cold face, under the displacer yoke\nNone  tri-clamp-transfer-cap  transfer-cap-2in-rod6  1  on the hot spool: displacer-rod gland, transfer boss +Y, gauge on top, relief below\nNone  tri-clamp-transfer-cap  transfer-cap-2in-blind  1  on the power spool's head end: transfer boss −Y, fill on top, plug below\nNone  sleeve-bushings  bushing-6x10x10  3  displacer-rod gland (2), guide block (1)\nNone  high-pressure-sanitary-clamps  hp-clamp-2in  4  rating above the 7 bar gauge relief setting (not drawn here)\nNone  tri-clamp-gasket  tc-gasket-2in  4  hot spool–cap, cap–power spool, power–bounce spool, bounce spool–gland cap\nNone  stirling-precision-rods  transfer-tube-12.7x0.89x64  1  transfer tube between the two 1/2 NPT fittings\nNone  npt-thread-envelopes  npt-1-2-male  2  1/2 NPT × 1/2 in tube fittings in the transfer bosses (bodies are the builder's choice)\nNone  tri-clamp-spool-bored-honed  spool-2in-3in-bored-48.00  1  power cylinder\nNone  stirling-clearance-seal-pistons  piston-48-gamma-m8  1  Ø48.00, rod side toward the crank\nNone  stirling-precision-rods  rod-8x304.85-m8  1  piston rod\nNone  hex-nuts-metric  nut-m8  2  lock nuts: piston boss, under the power yoke\nNone  tri-clamp-spool-npt-bosses  spool-2in-6in-3x-npt14  1  bounce space: fill on top, gauge and relief at 30° / 150°\nNone  tri-clamp-rod-gland-cap  gland-cap-2in-2x-8x12x20  1  closes the bounce spool; the piston rod's gland and guide\nNone  sleeve-bushings  bushing-8x12x20  2  in the gland cap\nNone  npt-thread-envelopes  npt-1-4-male  7  1/4 NPT stems: working-space gauge, relief, fill and plug; bounce-space fill, gauge and relief (bodies are the builder's choice)\nNone  stirling-crosshead-yokes  yoke-rod6-m6  1  displacer yoke, stub pin toward +Y\nNone  stirling-crosshead-yokes  yoke-rod8-m8  1  power yoke, stub pin toward −Y\nNone  dowel-pins-metric  dowel-5x20  2  stub wrist pins\nNone  shaft-collars  collar-5mm  2  on the wrist pins\nNone  set-screws-metric  set-m3x4  2  wrist-pin collars\nNone  stirling-conrods-626-625  conrod-626-625-100  2  displacer and power\nNone  ball-bearings-metric  bearing-626  2  big ends\nNone  ball-bearings-metric  bearing-625  2  small ends\nNone  stirling-built-up-crank-webs  crank-web-56x10-r15  1  displacer throw, outer\nNone  stirling-built-up-crank-webs  crank-web-56x11-r15  1  displacer throw, inner\nNone  stirling-built-up-crank-webs  crank-web-56x11-r18  1  power throw, inner\nNone  stirling-built-up-crank-webs  crank-web-56x10-r18  1  power throw, outer\nNone  dowel-pins-metric  dowel-6x30  2  crank pins (r 15 displacer, r 18 power, 90° apart)\nNone  stirling-precision-rods  shaft-8x56.5  1  crank stub, −Y bearing\nNone  stirling-precision-rods  shaft-8x88  1  crank centre shaft\nNone  stirling-precision-rods  shaft-8x46.3  1  crank stub, +Y bearing and flywheel\nNone  ball-bearings-metric  bearing-608  2  crank uprights\nNone  shaft-collars  collar-8mm  2  inside the uprights: axial location\nNone  set-screws-metric  set-m4x4  2  8 mm collars\nNone  nut-pocket-flywheels  flywheel-200-m12-b8  1  outboard of the +Y upright\nNone  hex-nut-weights  nut-m12  18  one in each rim pocket\nNone  set-screws-metric  set-m3x6  1  flywheel hub\nNone  spool-hanger-collars  hanger-2in-tab  2  power spool and bounce spool, bar down on the pedestals\nNone  spool-hanger-collars  hanger-2in-plain  2  close the hangers\nNone  socket-head-cap-screws-metric  shcs-m4x20  4  hanger ears\nNone  hex-nuts-metric  nut-m4  4  hanger ears\nNone  socket-head-cap-screws-metric  shcs-m5x20  4  hanger bars into the pedestals\nNone  round-belt-generator-drive  crank-pulley-84-b8  1  on the crankshaft's free end\nNone  set-screws-metric  set-m4x6  1  crank-pulley hub\nNone  gimbal-motor-2208-envelope  gimbal-motor-2208-envelope  1  the generator: 2208 gimbal outrunner, KV 128, 14.4 Ω (envelope at its published size)\nNone  countersunk-screws-metric  csk-m3x6  4  motor base to the bracket, heads flush\nNone  round-belt-generator-drive  generator-pulley-2208-pd13.33  1  on the motor's rotor top\nNone  socket-head-cap-screws-metric  shcs-m2x6  4  generator pulley to the rotor top\nNone  round-belt-generator-drive  round-belt-5-c90  1  drawn on its pitch line)\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-tri-clamp-horizontal-gamma\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-closed-hot-spool-bored",
  "stirling-slotted-regenerator-liner",
  "tri-clamp-spool-bored-honed",
  "tri-clamp-transfer-cap",
  "round-belt-generator-drive",
  "list-tri-clamp-walking-beam-gamma",
  "list-tri-clamp-charged-beta"
 ],
 "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": [],
 "faq": [
  {
   "q": "How much power?",
   "a": "In the model: 2–4 W at the crank at 600 rpm open to air (0.0–3.6 W at 26–28 V); charged to 5 bar gauge, 5–29 W on air and 13–61 W on helium at 1200 rpm."
  },
  {
   "q": "Can it run uncharged?",
   "a": "Yes: open the bounce-space ports and run it at 1 atm."
  },
  {
   "q": "Why are the cylinders side by side?",
   "a": "That is the classic desk layout, and it keeps the transfer passage short: two caps side by side and 64 mm of 1/2 in tube."
  },
  {
   "q": "What are the clamps?",
   "a": "High-pressure bolted sanitary clamps on every joint, rated above the relief setting."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/list-tri-clamp-horizontal-gamma/index.md"
}