{
 "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": "swash-plate-40mm",
 "name": "Swash (wobble) plates Ø40 at 10, 15 and 20°",
 "kind": "hardware",
 "category": "Stirling engines",
 "group": "Drives & mechanisms",
 "year": null,
 "question": "How much stroke does a swash plate give?",
 "tags": [
  "swash plate",
  "wobble plate",
  "axial",
  "multi-cylinder",
  "mechanism",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "swash plate 3d model",
  "wobble plate mechanism",
  "swashplate stroke",
  "wobble plate engine"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 3,
 "url": "https://xemstudio.com/objects/swash-plate-40mm/",
 "sheet_txt": "https://xemstudio.com/objects/swash-plate-40mm/sheet.txt",
 "sheet": {
  "basis": "A follower at radius r on a plate tilted θ moves 2 r sin θ per turn; Ø40 × 4 plate on a Ø13 × 20 hub",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A Ø40 × 4 plate set at 10, 15 or 20° on a Ø13 × 20 hub with a Ø5 bore; a radial Ø2.5 hole (M3 tap drill) 6 mm from the hub's mid-length locks it.",
   "Stroke = 2 × r × sin θ. At the rim (r 20): 6.9, 10.4, 13.7 mm; at r 18: 6.3, 9.3, 12.3 mm.",
   "Followers spaced round one plate drive several cylinders from one shaft; each peaks at a shaft angle set by its position."
  ],
  "table": {
   "columns": [
    "file",
    "tilt",
    "stroke r 20",
    "stroke r 18",
    "hub",
    "bore"
   ],
   "rows": [
    [
     "swash-plate-40-10deg",
     "10°",
     6.9,
     6.3,
     "Ø13 × 20",
     5
    ],
    [
     "swash-plate-40-15deg",
     "15°",
     10.4,
     9.3,
     "Ø13 × 20",
     5
    ],
    [
     "swash-plate-40-20deg",
     "20°",
     13.7,
     12.3,
     "Ø13 × 20",
     5
    ]
   ]
  }
 },
 "sheet_text": "Swash (wobble) plates Ø40 at 10, 15 and 20° — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/swash-plate-40mm/  (CC BY 4.0)\nBasis: A follower at radius r on a plate tilted θ moves 2 r sin θ per turn; Ø40 × 4 plate on a Ø13 × 20 hub\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A Ø40 × 4 plate set at 10, 15 or 20° on a Ø13 × 20 hub with a Ø5 bore; a radial Ø2.5 hole (M3 tap drill) 6 mm from the hub's mid-length locks it.\n- Stroke = 2 × r × sin θ. At the rim (r 20): 6.9, 10.4, 13.7 mm; at r 18: 6.3, 9.3, 12.3 mm.\n- Followers spaced round one plate drive several cylinders from one shaft; each peaks at a shaft angle set by its position.\n\nfile  tilt  stroke r 20  stroke r 18  hub  bore\nswash-plate-40-10deg  10°  6.9  6.3  Ø13 × 20  5\nswash-plate-40-15deg  15°  10.4  9.3  Ø13 × 20  5\nswash-plate-40-20deg  20°  13.7  12.3  Ø13 × 20  5\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Swashplate — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Swashplate\n- Long Earth Society: Engine and rig builds on extrusion frames — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 3 parts): https://xemstudio.com/files/hardware/swash-plate-40mm/index.json\nAPI: https://xemstudio.com/api/geometry?object=swash-plate-40mm\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Swashplate",
   "url": "https://en.wikipedia.org/wiki/Swashplate",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine and rig builds on extrusion frames",
   "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": [
  "swash-follower",
  "metric-shafts",
  "shaft-collars",
  "eccentric-sheaves",
  "scotch-yoke"
 ],
 "fits": [
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "metric-shafts",
     "why": "Ø5 shaft, M3 grub"
    }
   ]
  },
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "swash-follower",
     "why": "Ø8 ball on the plate face"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "eccentric-sheaves",
     "why": "single strap drive"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "shaft-collars",
     "why": "locates the plate"
    }
   ]
  }
 ],
 "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": "hub bore",
   "exact": "Ø5",
   "mates": "Ø5 shaft",
   "fit": "slide",
   "files": "swash-plate-"
  },
  {
   "feature": "set-screw hole",
   "exact": "Ø2.5",
   "mates": "M3 tap drill",
   "fit": "designed",
   "files": "swash-plate-"
  }
 ],
 "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 much stroke does a swash plate give?",
   "a": "2 × r × sin θ: the Ø40 plate at 15° gives 9.3 mm to a follower at r 18."
  },
  {
   "q": "Can one plate drive more than one cylinder?",
   "a": "Yes: followers spaced round the plate each reach top of stroke at a different shaft angle."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "swash-plate-40-10deg",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/swash-plate/swash-plate-40-10deg.step",
   "stl": "https://xemstudio.com/files/hardware/swash-plate/swash-plate-40-10deg.stl",
   "note": "swash (wobble) plate Ø40, 10° tilt, 6.9 mm stroke at the rim, Ø5 shaft, Ø2.5 set-screw hole"
  },
  {
   "file": "swash-plate-40-15deg",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/swash-plate/swash-plate-40-15deg.step",
   "stl": "https://xemstudio.com/files/hardware/swash-plate/swash-plate-40-15deg.stl",
   "note": "swash (wobble) plate Ø40, 15° tilt, 10.4 mm stroke at the rim, Ø5 shaft, Ø2.5 set-screw hole"
  },
  {
   "file": "swash-plate-40-20deg",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/swash-plate/swash-plate-40-20deg.step",
   "stl": "https://xemstudio.com/files/hardware/swash-plate/swash-plate-40-20deg.stl",
   "note": "swash (wobble) plate Ø40, 20° tilt, 13.7 mm stroke at the rim, Ø5 shaft, Ø2.5 set-screw hole"
  }
 ],
 "markdown": "https://xemstudio.com/objects/swash-plate-40mm/index.md"
}