{
 "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-elbow-diaphragm-alpha",
 "name": "Build list: Tri-clamp elbow diaphragm alpha, 2 in",
 "kind": "list",
 "category": "Stirling engines",
 "group": "Guide",
 "year": null,
 "question": "What parts do I need to build a Tri-clamp elbow diaphragm alpha, 2 in?",
 "tags": [
  "list",
  "build",
  "stirling",
  "long earth society",
  "tri-clamp",
  "diaphragm",
  "alpha",
  "torch"
 ],
 "aliases": [
  "tri clamp alpha stirling",
  "diaphragm alpha stirling",
  "pipe fitting stirling engine tri clamp",
  "torch stirling engine diaphragm",
  "tri clamp stirling 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-elbow-diaphragm-alpha/",
 "sheet_txt": "https://xemstudio.com/objects/list-tri-clamp-elbow-diaphragm-alpha/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": [
   "A torch-heated alpha in 2 in tri-clamp: a square of fittings with a diaphragm head on each tee branch and both rods on one crank pin at 90°.",
   "Numbers: 2 in · two diaphragms at 15 mm stroke, 14.2 mL each, 90° on one pin · dead volume 478 mL with the fillers (1228 without) · swept / dead 0.030"
  ],
  "table": {
   "columns": [
    "subsystem",
    "object",
    "parts",
    "qty",
    "note"
   ],
   "rows": [
    [
     null,
     "tri-clamp-diaphragm-alpha-frame",
     "alpha-frame-2in",
     1,
     "base, two feet, diagonal strut, bearing block"
    ],
    [
     null,
     "tri-clamp-torch-stand",
     "torch-stand-40",
     1,
     "under the middle of the hot spool; the heat source is a torch flame"
    ],
    [
     null,
     "socket-head-cap-screws-metric",
     "shcs-m4x20",
     2,
     "torch stand to the frame"
    ],
    [
     null,
     "sanitary-clamp-elbows",
     "elbow-90-2in",
     1,
     "the corner: hot leg to cold leg"
    ],
    [
     null,
     "sanitary-clamp-spools",
     "spool-2in-3in",
     2,
     "hot leg (over the flame) and cold leg (cooler)"
    ],
    [
     null,
     "sanitary-clamp-tees",
     "tee-short-2in",
     2,
     "hot tee (branch up) and cold tee (branch inward)"
    ],
    [
     null,
     "tri-clamp-end-cap",
     "tc-cap-2in-flat",
     2,
     "close the tees' runs"
    ],
    [
     null,
     "tri-clamp-hot-gasket",
     "hot-gasket-2in",
     2,
     "both hot-spool joints"
    ],
    [
     null,
     "tri-clamp-heat-shield",
     "heat-shield-2in",
     2,
     "on the hot spool, flame side of each clamp"
    ],
    [
     null,
     "tri-clamp-gasket",
     "tc-gasket-2in",
     4,
     "cap joints, elbow–cold spool, cold spool–cold tee"
    ],
    [
     null,
     "tri-clamp-clamps",
     "clamp-half-2in",
     16,
     "eight joints, two halves each"
    ],
    [
     null,
     "socket-head-cap-screws-metric",
     "shcs-m5x30",
     16,
     "clamp bolts"
    ],
    [
     null,
     "hex-nuts-metric",
     "nut-m5",
     16,
     "clamp nuts, in the hex traps"
    ],
    [
     null,
     "regenerator-cage",
     "regenerator-cage-47-5x40",
     1,
     "in the cold spool at the elbow joint, on the gasket lip"
    ],
    [
     null,
     "regenerator-mesh-disc",
     "mesh-disc-44mm",
     80,
     "fill the cage, 40 mm"
    ],
    [
     null,
     "tri-clamp-volume-filler",
     "plug-tee-2in-blind",
     2,
     "fill both tee runs; passage from the spool side to the branch"
    ],
    [
     null,
     "tri-clamp-volume-filler",
     "sleeve-2in-76.2",
     1,
     "hot spool: 1 mm heater gap"
    ],
    [
     null,
     "tri-clamp-volume-filler",
     "sleeve-2in-32",
     1,
     "cold spool above the regenerator: 1 mm cooler gap"
    ],
    [
     null,
     "tri-clamp-finned-cooler",
     "cooler-half-2in-56",
     2,
     "on the cold spool; or the jacket shell"
    ],
    [
     null,
     "socket-head-cap-screws-metric",
     "shcs-m4x30",
     4,
     "cooler (or jacket) ears"
    ],
    [
     null,
     "hex-nuts-metric",
     "nut-m4",
     6,
     "cooler (or jacket) ears (4), torch stand (2)"
    ],
    [
     null,
     "tri-clamp-jacket-shell",
     "jacket-half-2in-56",
     2,
     "optional, in place of the finned cooler"
    ],
    [
     null,
     "tri-clamp-jacket-shell",
     "jacket-port-cap",
     2,
     "optional, one per jacket half"
    ],
    [
     null,
     "tri-clamp-diaphragm-head",
     "diaphragm-head-2in",
     2,
     "hot (up) and cold (inward)"
    ],
    [
     null,
     "tri-clamp-diaphragm-membrane",
     "membrane-2in",
     2,
     "clamped in place of the gaskets"
    ],
    [
     null,
     "tri-clamp-diaphragm-disc",
     "diaphragm-disc-2in",
     2,
     "head side of each membrane, carries the rod"
    ],
    [
     null,
     "tri-clamp-diaphragm-disc",
     "diaphragm-backing-2in",
     2,
     "gas side of each membrane"
    ],
    [
     null,
     "socket-head-cap-screws-metric",
     "shcs-m2x8",
     6,
     "three per membrane"
    ],
    [
     null,
     "hex-nuts-metric",
     "nut-m2",
     6,
     "three per membrane"
    ],
    [
     null,
     "displacer-rods",
     "rod-3x150",
     2,
     "diaphragm rods"
    ],
    [
     null,
     "rod-clevises",
     "rod-clevis-3mm",
     2,
     "one per rod"
    ],
    [
     null,
     "connecting-rods-623",
     "conrod-50",
     2,
     "both on the one crank pin"
    ],
    [
     null,
     "ball-bearings-metric",
     "bearing-623",
     4,
     "con-rod eyes"
    ],
    [
     null,
     "dowel-pins-metric",
     "dowel-3x20",
     2,
     "clevis pins: each con-rod sits beside its clevis on the pin"
    ],
    [
     null,
     "dowel-pins-metric",
     "dowel-3x30",
     1,
     "crank pin"
    ],
    [
     null,
     "counterweighted-crank-discs",
     "cw-crank-disc-stroke15",
     1,
     "15 stroke, one pin"
    ],
    [
     null,
     "stirling-crankshafts",
     "crankshaft-5x80-dflat",
     1,
     ""
    ],
    [
     null,
     "ball-bearings-metric",
     "bearing-625",
     2,
     "in the strut's bearing block"
    ],
    [
     null,
     "shaft-collars",
     "collar-5mm",
     2,
     "either side of the bearing block"
    ],
    [
     null,
     "nut-pocket-flywheels",
     "flywheel-150-m10-b5",
     1,
     "behind the bearing block"
    ],
    [
     null,
     "hex-nut-weights",
     "nut-m10",
     18,
     "one in each rim pocket"
    ],
    [
     null,
     "set-screws-metric",
     "set-m3x4",
     8,
     "grubs: 2 diaphragm discs, 2 clevises, crank disc, 2 collars, flywheel"
    ],
    [
     null,
     "set-screws-metric",
     "set-m4x10",
     3,
     "centre the torch head in the stand ring"
    ]
   ]
  }
 },
 "sheet_text": "Build list: Tri-clamp elbow diaphragm alpha, 2 in — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/list-tri-clamp-elbow-diaphragm-alpha/  (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- A torch-heated alpha in 2 in tri-clamp: a square of fittings with a diaphragm head on each tee branch and both rods on one crank pin at 90°.\n- Numbers: 2 in · two diaphragms at 15 mm stroke, 14.2 mL each, 90° on one pin · dead volume 478 mL with the fillers (1228 without) · swept / dead 0.030\n\nsubsystem  object  parts  qty  note\nNone  tri-clamp-diaphragm-alpha-frame  alpha-frame-2in  1  base, two feet, diagonal strut, bearing block\nNone  tri-clamp-torch-stand  torch-stand-40  1  under the middle of the hot spool; the heat source is a torch flame\nNone  socket-head-cap-screws-metric  shcs-m4x20  2  torch stand to the frame\nNone  sanitary-clamp-elbows  elbow-90-2in  1  the corner: hot leg to cold leg\nNone  sanitary-clamp-spools  spool-2in-3in  2  hot leg (over the flame) and cold leg (cooler)\nNone  sanitary-clamp-tees  tee-short-2in  2  hot tee (branch up) and cold tee (branch inward)\nNone  tri-clamp-end-cap  tc-cap-2in-flat  2  close the tees' runs\nNone  tri-clamp-hot-gasket  hot-gasket-2in  2  both hot-spool joints\nNone  tri-clamp-heat-shield  heat-shield-2in  2  on the hot spool, flame side of each clamp\nNone  tri-clamp-gasket  tc-gasket-2in  4  cap joints, elbow–cold spool, cold spool–cold tee\nNone  tri-clamp-clamps  clamp-half-2in  16  eight joints, two halves each\nNone  socket-head-cap-screws-metric  shcs-m5x30  16  clamp bolts\nNone  hex-nuts-metric  nut-m5  16  clamp nuts, in the hex traps\nNone  regenerator-cage  regenerator-cage-47-5x40  1  in the cold spool at the elbow joint, on the gasket lip\nNone  regenerator-mesh-disc  mesh-disc-44mm  80  fill the cage, 40 mm\nNone  tri-clamp-volume-filler  plug-tee-2in-blind  2  fill both tee runs; passage from the spool side to the branch\nNone  tri-clamp-volume-filler  sleeve-2in-76.2  1  hot spool: 1 mm heater gap\nNone  tri-clamp-volume-filler  sleeve-2in-32  1  cold spool above the regenerator: 1 mm cooler gap\nNone  tri-clamp-finned-cooler  cooler-half-2in-56  2  on the cold spool; or the jacket shell\nNone  socket-head-cap-screws-metric  shcs-m4x30  4  cooler (or jacket) ears\nNone  hex-nuts-metric  nut-m4  6  cooler (or jacket) ears (4), torch stand (2)\nNone  tri-clamp-jacket-shell  jacket-half-2in-56  2  optional, in place of the finned cooler\nNone  tri-clamp-jacket-shell  jacket-port-cap  2  optional, one per jacket half\nNone  tri-clamp-diaphragm-head  diaphragm-head-2in  2  hot (up) and cold (inward)\nNone  tri-clamp-diaphragm-membrane  membrane-2in  2  clamped in place of the gaskets\nNone  tri-clamp-diaphragm-disc  diaphragm-disc-2in  2  head side of each membrane, carries the rod\nNone  tri-clamp-diaphragm-disc  diaphragm-backing-2in  2  gas side of each membrane\nNone  socket-head-cap-screws-metric  shcs-m2x8  6  three per membrane\nNone  hex-nuts-metric  nut-m2  6  three per membrane\nNone  displacer-rods  rod-3x150  2  diaphragm rods\nNone  rod-clevises  rod-clevis-3mm  2  one per rod\nNone  connecting-rods-623  conrod-50  2  both on the one crank pin\nNone  ball-bearings-metric  bearing-623  4  con-rod eyes\nNone  dowel-pins-metric  dowel-3x20  2  clevis pins: each con-rod sits beside its clevis on the pin\nNone  dowel-pins-metric  dowel-3x30  1  crank pin\nNone  counterweighted-crank-discs  cw-crank-disc-stroke15  1  15 stroke, one pin\nNone  stirling-crankshafts  crankshaft-5x80-dflat  1  \nNone  ball-bearings-metric  bearing-625  2  in the strut's bearing block\nNone  shaft-collars  collar-5mm  2  either side of the bearing block\nNone  nut-pocket-flywheels  flywheel-150-m10-b5  1  behind the bearing block\nNone  hex-nut-weights  nut-m10  18  one in each rim pocket\nNone  set-screws-metric  set-m3x4  8  grubs: 2 diaphragm discs, 2 clevises, crank disc, 2 collars, flywheel\nNone  set-screws-metric  set-m4x10  3  centre the torch head in the stand ring\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-elbow-diaphragm-alpha\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-diaphragm-head",
  "tri-clamp-diaphragm-membrane",
  "tri-clamp-diaphragm-disc",
  "tri-clamp-volume-filler",
  "tri-clamp-finned-cooler",
  "tri-clamp-jacket-shell",
  "tri-clamp-torch-stand",
  "tri-clamp-diaphragm-alpha-frame",
  "sanitary-clamp-elbows",
  "sanitary-clamp-tees"
 ],
 "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": "What parts do I need for the tri-clamp elbow diaphragm alpha?",
   "a": "43 parts, every one a free STEP/STL on this site; see the table and the build order on this page."
  },
  {
   "q": "How does one crank pin give 90°?",
   "a": "The hot rod is vertical and the cold rod horizontal, and both lines pass through the crank axis, so the two strokes are a quarter turn apart."
  },
  {
   "q": "How far is the hot diaphragm from the flame?",
   "a": "About 144 mm from the flame's contact point on the hot spool to the centre of the hot membrane, with the clamped hot-tee joint and the tee between them."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/list-tri-clamp-elbow-diaphragm-alpha/index.md"
}