{
 "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": "deadbeat-escapement-mechanism",
 "name": "Dead-beat (Graham) escapement: escape wheel and anchor",
 "kind": "hardware",
 "category": "Mechanisms",
 "group": "Escapements",
 "year": null,
 "question": "How does a dead-beat escapement work?",
 "tags": [
  "mechanism",
  "escapements",
  "kinematics",
  "507 mechanical movements"
 ],
 "aliases": [
  "deadbeat escapement",
  "anchor escapement",
  "clock escapement",
  "pendulum escapement",
  "graham escapement",
  "escape de áncora sin retroceso (Graham)",
  "Grahamhemmung (ruhende Ankerhemmung)"
 ],
 "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/deadbeat-escapement-mechanism/",
 "sheet_txt": "https://xemstudio.com/objects/deadbeat-escapement-mechanism/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design following Brown No. 289 (1868)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "An anchor rocked by a pendulum lets the escape wheel advance one tooth every two beats: a tooth is locked on one pallet, released as the anchor swings, gives the pallet a small push across its slanted impulse face, and the wheel drops until the other pallet catches the next tooth.",
   "Dead-beat (Graham, 1715): the locking faces are arcs about the anchor pivot, so while a tooth rests on them the wheel stands perfectly still (the seconds hand does not recoil) and the pendulum swings freer — the escapement of precision regulators.",
   "Drawn with a tooth tip resting on the entry pallet's locking face (contact only, wheel turned -4.83°). Brown's No. 289.",
   "Parts (each has its own page): escape-wheel-30t-d50, deadbeat-anchor-for-30t-d50, dowel-pins-metric.",
   "Brown's movement No. 289 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size."
  ],
  "table": {
   "columns": [
    "parameter",
    "value"
   ],
   "rows": [
    [
     "escape wheel",
     "30 T, Ø50"
    ],
    [
     "anchor span",
     "7½ teeth"
    ],
    [
     "pivot height",
     "35.36 mm"
    ],
    [
     "beats",
     "2 per tooth (60 per wheel turn)"
    ],
    [
     "type",
     "dead-beat"
    ]
   ]
  }
 },
 "sheet_text": "Dead-beat (Graham) escapement: escape wheel and anchor — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/deadbeat-escapement-mechanism/  (CC BY 4.0)\nBasis: Xem Studio design following Brown No. 289 (1868)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- An anchor rocked by a pendulum lets the escape wheel advance one tooth every two beats: a tooth is locked on one pallet, released as the anchor swings, gives the pallet a small push across its slanted impulse face, and the wheel drops until the other pallet catches the next tooth.\n- Dead-beat (Graham, 1715): the locking faces are arcs about the anchor pivot, so while a tooth rests on them the wheel stands perfectly still (the seconds hand does not recoil) and the pendulum swings freer — the escapement of precision regulators.\n- Drawn with a tooth tip resting on the entry pallet's locking face (contact only, wheel turned -4.83°). Brown's No. 289.\n- Parts (each has its own page): escape-wheel-30t-d50, deadbeat-anchor-for-30t-d50, dowel-pins-metric.\n- Brown's movement No. 289 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.\n\nparameter  value\nescape wheel  30 T, Ø50\nanchor span  7½ teeth\npivot height  35.36 mm\nbeats  2 per tooth (60 per wheel turn)\ntype  dead-beat\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. 289: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_289.html\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/deadbeat-escapement-mechanism/index.json\nAPI: https://xemstudio.com/api/geometry?object=deadbeat-escapement-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. 289: figure, his text and an animation",
   "url": "https://507movements.com/mm_289.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": [
  "escape-wheel-30t-d50",
  "deadbeat-anchor-for-30t-d50",
  "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 a dead-beat escapement work?",
   "a": "An anchor rocked by a pendulum lets the escape wheel advance one tooth every two beats: a tooth is locked on one pallet, released as the anchor swings, gives the pallet a small push across its slanted impulse face, and the wheel drops until the other pallet catches the next tooth."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "deadbeat-escapement-mechanism-assembly",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/deadbeat-escapement-mechanism/deadbeat-escapement-mechanism-assembly.step",
   "stl": "https://xemstudio.com/files/hardware/deadbeat-escapement-mechanism/deadbeat-escapement-mechanism-assembly.stl",
   "note": "Assembled mechanism, all parts placed at one pose (STEP keeps each part separate)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/deadbeat-escapement-mechanism/index.md"
}