{
 "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-beta-rhombic-2in",
 "name": "Build list: Beta Stirling, rhombic drive, 2 in tri-clamp",
 "kind": "list",
 "category": "Stirling engines",
 "group": "Guide",
 "year": null,
 "question": "What parts do I need to build a Beta Stirling, rhombic drive, 2 in tri-clamp?",
 "tags": [
  "list",
  "build",
  "stirling",
  "beta",
  "long earth society"
 ],
 "aliases": [
  "beta stirling, rhombic drive, 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-beta-rhombic-2in/",
 "sheet_txt": "https://xemstudio.com/objects/list-beta-rhombic-2in/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": [
   "Displacer and piston in one bore, two counter-rotating gears: the balanced one.",
   "Numbers: Ø46 × 90 regenerative displacer · Ø40 lapped piston · 16 mm strokes · phase ~90° from c 32 / e 8 / L 40"
  ],
  "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; stainless for a burner"
    ],
    [
     "Cylinder",
     "tri-clamp-spool",
     "tc-spool-2in-6in",
     1,
     "buy",
     "stainless, 16 ga, 47.5 bore"
    ],
    [
     "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-regenerative-2in-90, displacer-regenerative-cap-2in",
     1,
     "print",
     "slots packed with #100 mesh; Ø3 rod on the cap's M3 grub"
    ],
    [
     "Power piston",
     "tri-clamp-power-pistons",
     "piston-2in-f020-rod, lapping-handle-2in",
     1,
     "print",
     "lap to fit in the spool; 3 × 5 × 6 bushing in the crown"
    ],
    [
     "Piston plug",
     "tri-clamp-free-piston-kit",
     "fp-piston-plug-2in",
     1,
     "print",
     "drops into the skirt; carries the 5 mm tube rod"
    ],
    [
     "Wrist dowels",
     "dowel-pins-metric",
     "dowel-3x16",
     2,
     "buy",
     "through bosses and plug legs"
    ],
    [
     "Rod bushing",
     "bearing-housings-and-rod-supports",
     "bushing-3x5x6",
     1,
     "buy",
     "dry: graphite-bronze, or sintered bronze degreased in acetone; no oil"
    ],
    [
     "Rods",
     "brass-tube-ks",
     "brass-5mm",
     1,
     "buy",
     "5 mm K&S tube = piston rod into the plug (printed tube-rod for a mock-up)"
    ],
    [
     "Displacer rod",
     "stirling-shafts-and-rods",
     "rod-3x200",
     1,
     "print",
     "cut to length; steel Ø3 for running"
    ],
    [
     "Frame head",
     "stirling-linkage-fittings",
     "rhombic-frame-head-2in",
     1,
     "print",
     "clamps on the spool's open ferrule; gear axes 70 mm above the face"
    ],
    [
     "Stand",
     "spool-hanger-collars",
     "hanger-2in-tab, hanger-2in-plain",
     1,
     "print",
     "clamps the cold half; bolts to a 2020 crossbar so the hot end hangs over the flame"
    ],
    [
     "Frame rails",
     "t-slot-extrusions",
     "2020-100",
     3,
     "buy",
     "two uprights + crossbar, cut to suit the flame height; M5 T-nuts"
    ],
    [
     "Drive",
     "rhombic-drive-kit",
     "crank-gear-30t-e8-left, crank-gear-30t-e8-right, link-40-1, link-40-2, link-40-3, link-40-4, yoke-upper-displacer, yoke-lower-piston, gear-frame-plate-c32",
     1,
     "print",
     "print two frame plates; gears meshed 180° apart"
    ],
    [
     "Pins",
     "dowel-pins-metric",
     "dowel-3x12",
     6,
     "buy",
     "2 crank pins + 4 link pivots"
    ],
    [
     "Bearings",
     "ball-bearings-metric",
     "bearing-625",
     4,
     "buy",
     "in the frame plates"
    ],
    [
     "Shafts",
     "stirling-shafts-and-rods",
     "crankshaft-5x80-dflat, crankshaft-5x120-dflat",
     1,
     "print",
     "gear shafts; the 120 carries the flywheel"
    ],
    [
     "Flywheel",
     "nut-weighted-flywheels",
     "flywheel-120-m10-b5",
     1,
     "print",
     "Ø5 hub, no adapter; 12 M10 nuts"
    ],
    [
     "Fasteners",
     "socket-head-cap-screws-metric",
     "shcs-m3x10",
     4,
     "buy",
     "plates to the frame head uprights"
    ],
    [
     "Heat",
     "tea-light-candles",
     "tea-light-maxi-58x24",
     1,
     "buy",
     ""
    ]
   ]
  }
 },
 "sheet_text": "Build list: Beta Stirling, rhombic drive, 2 in tri-clamp — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/list-beta-rhombic-2in/  (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- Displacer and piston in one bore, two counter-rotating gears: the balanced one.\n- Numbers: Ø46 × 90 regenerative displacer · Ø40 lapped piston · 16 mm strokes · phase ~90° from c 32 / e 8 / L 40\n\nsubsystem  object  parts  qty  print_or_buy  note\nHot end  tri-clamp-end-cap  tc-cap-2in-flat  1  print  flame side; stainless for a burner\nCylinder  tri-clamp-spool  tc-spool-2in-6in  1  buy  stainless, 16 ga, 47.5 bore\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-regenerative-2in-90, displacer-regenerative-cap-2in  1  print  slots packed with #100 mesh; Ø3 rod on the cap's M3 grub\nPower piston  tri-clamp-power-pistons  piston-2in-f020-rod, lapping-handle-2in  1  print  lap to fit in the spool; 3 × 5 × 6 bushing in the crown\nPiston plug  tri-clamp-free-piston-kit  fp-piston-plug-2in  1  print  drops into the skirt; carries the 5 mm tube rod\nWrist dowels  dowel-pins-metric  dowel-3x16  2  buy  through bosses and plug legs\nRod bushing  bearing-housings-and-rod-supports  bushing-3x5x6  1  buy  dry: graphite-bronze, or sintered bronze degreased in acetone; no oil\nRods  brass-tube-ks  brass-5mm  1  buy  5 mm K&S tube = piston rod into the plug (printed tube-rod for a mock-up)\nDisplacer rod  stirling-shafts-and-rods  rod-3x200  1  print  cut to length; steel Ø3 for running\nFrame head  stirling-linkage-fittings  rhombic-frame-head-2in  1  print  clamps on the spool's open ferrule; gear axes 70 mm above the face\nStand  spool-hanger-collars  hanger-2in-tab, hanger-2in-plain  1  print  clamps the cold half; bolts to a 2020 crossbar so the hot end hangs over the flame\nFrame rails  t-slot-extrusions  2020-100  3  buy  two uprights + crossbar, cut to suit the flame height; M5 T-nuts\nDrive  rhombic-drive-kit  crank-gear-30t-e8-left, crank-gear-30t-e8-right, link-40-1, link-40-2, link-40-3, link-40-4, yoke-upper-displacer, yoke-lower-piston, gear-frame-plate-c32  1  print  print two frame plates; gears meshed 180° apart\nPins  dowel-pins-metric  dowel-3x12  6  buy  2 crank pins + 4 link pivots\nBearings  ball-bearings-metric  bearing-625  4  buy  in the frame plates\nShafts  stirling-shafts-and-rods  crankshaft-5x80-dflat, crankshaft-5x120-dflat  1  print  gear shafts; the 120 carries the flywheel\nFlywheel  nut-weighted-flywheels  flywheel-120-m10-b5  1  print  Ø5 hub, no adapter; 12 M10 nuts\nFasteners  socket-head-cap-screws-metric  shcs-m3x10  4  buy  plates to the frame head uprights\nHeat  tea-light-candles  tea-light-maxi-58x24  1  buy  \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-beta-rhombic-2in\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",
  "tri-clamp-power-pistons",
  "tri-clamp-free-piston-kit",
  "dowel-pins-metric",
  "bearing-housings-and-rod-supports",
  "brass-tube-ks",
  "stirling-shafts-and-rods",
  "stirling-linkage-fittings",
  "spool-hanger-collars"
 ],
 "fits": [],
 "faq": [
  {
   "q": "What parts do I need to build a Beta Stirling, rhombic drive, 2 in tri-clamp?",
   "a": "25 printed parts (all free here) and 10 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-beta-rhombic-2in/index.md"
}