{
 "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": "eccentric-and-slotted-yoke-mechanism",
 "name": "Eccentric in a slotted yoke (harmonic straight-line motion)",
 "kind": "hardware",
 "category": "Mechanisms",
 "group": "Linkages",
 "year": null,
 "question": "How does an eccentric drive a yoke?",
 "tags": [
  "mechanism",
  "linkages",
  "kinematics",
  "507 mechanical movements"
 ],
 "aliases": [
  "eccentric yoke",
  "eccentric scotch yoke",
  "harmonic motion eccentric",
  "excéntrica con yugo ranurado",
  "Exzenter mit Kulisse"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/eccentric-and-slotted-yoke-mechanism/",
 "sheet_txt": "https://xemstudio.com/objects/eccentric-and-slotted-yoke-mechanism/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design following Brown No. 90 (1868)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "An eccentric (a disc turning about an off-centre shaft) inside a yoke whose two faces touch it: the yoke moves straight with simple harmonic motion, y = e·sin θ, stroke 2e = 10 mm here.",
   "It is the eccentric form of the Scotch yoke: no pin, the whole disc is the crank; contact is on the two flat faces.",
   "Brown's No. 90 (No. 89 with the strap replaced by a yoke so the rod does not swing).",
   "Parts (each has its own page): eccentric-sheaves, eccentric-slotted-yoke-30, dowel-pins-metric.",
   "Brown's movement No. 90 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size."
  ],
  "table": {
   "columns": [
    "parameter",
    "value"
   ],
   "rows": [
    [
     "eccentric",
     "Ø30, 5 mm offset (catalog part)"
    ],
    [
     "stroke",
     "10 mm"
    ],
    [
     "yoke slot",
     "30 mm"
    ]
   ]
  }
 },
 "sheet_text": "Eccentric in a slotted yoke (harmonic straight-line motion) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/eccentric-and-slotted-yoke-mechanism/  (CC BY 4.0)\nBasis: Xem Studio design following Brown No. 90 (1868)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- An eccentric (a disc turning about an off-centre shaft) inside a yoke whose two faces touch it: the yoke moves straight with simple harmonic motion, y = e·sin θ, stroke 2e = 10 mm here.\n- It is the eccentric form of the Scotch yoke: no pin, the whole disc is the crank; contact is on the two flat faces.\n- Brown's No. 90 (No. 89 with the strap replaced by a yoke so the rod does not swing).\n- Parts (each has its own page): eccentric-sheaves, eccentric-slotted-yoke-30, dowel-pins-metric.\n- Brown's movement No. 90 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.\n\nparameter  value\neccentric  Ø30, 5 mm offset (catalog part)\nstroke  10 mm\nyoke slot  30 mm\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Henry T. Brown (1868, public domain): Five Hundred and Seven Mechanical Movements — scan on archive.org — web — Publisher's page; dimensions are facts — https://archive.org/details/fivehundredseven00browiala\n- 507movements.com: Brown's movement No. 90: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_090.html\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/eccentric-and-slotted-yoke-mechanism/index.json\nAPI: https://xemstudio.com/api/geometry?object=eccentric-and-slotted-yoke-mechanism\n",
 "sources": [
  {
   "publisher": "Henry T. Brown (1868, public domain)",
   "title": "Five Hundred and Seven Mechanical Movements — scan on archive.org",
   "url": "https://archive.org/details/fivehundredseven00browiala",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "507movements.com",
   "title": "Brown's movement No. 90: figure, his text and an animation",
   "url": "https://507movements.com/mm_090.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "eccentric-sheaves",
  "eccentric-slotted-yoke-30",
  "dowel-pins-metric"
 ],
 "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 does an eccentric drive a yoke?",
   "a": "An eccentric (a disc turning about an off-centre shaft) inside a yoke whose two faces touch it: the yoke moves straight with simple harmonic motion, y = e·sin θ, stroke 2e = 10 mm here."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "eccentric-and-slotted-yoke-mechanism-assembly",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/eccentric-and-slotted-yoke-mechanism/eccentric-and-slotted-yoke-mechanism-assembly.step",
   "stl": "https://xemstudio.com/files/hardware/eccentric-and-slotted-yoke-mechanism/eccentric-and-slotted-yoke-mechanism-assembly.stl",
   "note": "Assembled mechanism, all parts placed at one pose (STEP keeps each part separate)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/eccentric-and-slotted-yoke-mechanism/index.md"
}