{
 "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": "grooved-heart-cam-r20-h20",
 "name": "Grooved heart cam (face cam), uniform motion, 20 mm stroke",
 "kind": "modern",
 "category": "Hardware",
 "group": "Mechanism parts",
 "year": null,
 "question": "What is a grooved heart cam?",
 "tags": [
  "mechanism part",
  "507 mechanical movements"
 ],
 "aliases": [
  "grooved cam",
  "face cam",
  "heart cam groove",
  "positive drive cam",
  "leva de corazón ranurada",
  "Herznutkurve"
 ],
 "overall_mm": {
  "length": 102,
  "width": 102,
  "height": 10
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/grooved-heart-cam-r20-h20/",
 "sheet_txt": "https://xemstudio.com/objects/grooved-heart-cam-r20-h20/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design following Brown's figure (1868); true size, no printing allowance",
  "overall_mm": {
   "length": 102,
   "width": 102,
   "height": 10
  },
  "notes": [
   "Ø92 × 10 disc with a 10 mm wide, 6 mm deep groove in its face: the groove's centre line is a heart (radius 20 → 40 mm over 180° and back), so a Ø10 roller in it is driven both ways — no spring needed. Ø5 bore.",
   "Groove walls are the centre line offset ±5 mm (the roller radius); uniform speed out and back, reversing at the cusps.",
   "Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features)."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "disc",
     "Ø92 × 10 mm"
    ],
    [
     "groove",
     "10 wide × 6 deep"
    ],
    [
     "stroke",
     "20 mm, uniform velocity"
    ],
    [
     "bore",
     "Ø5"
    ]
   ]
  }
 },
 "sheet_text": "Grooved heart cam (face cam), uniform motion, 20 mm stroke — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/grooved-heart-cam-r20-h20/  (CC BY 4.0)\nBasis: Xem Studio design following Brown's figure (1868); true size, no printing allowance\nCatalog version: 2026-10-20\n\nOverall (mm): length 102.0, width 102.0, height 10.0\n- Ø92 × 10 disc with a 10 mm wide, 6 mm deep groove in its face: the groove's centre line is a heart (radius 20 → 40 mm over 180° and back), so a Ø10 roller in it is driven both ways — no spring needed. Ø5 bore.\n- Groove walls are the centre line offset ±5 mm (the roller radius); uniform speed out and back, reversing at the cusps.\n- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).\n\ndimension  value\ndisc  Ø92 × 10 mm\ngroove  10 wide × 6 deep\nstroke  20 mm, uniform velocity\nbore  Ø5\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. 97: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_097.html\n- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/grooved-heart-cam-mechanism/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/grooved-heart-cam-r20-h20/index.json\nAPI: https://xemstudio.com/api/geometry?object=grooved-heart-cam-r20-h20\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. 97: figure, his text and an animation",
   "url": "https://507movements.com/mm_097.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Xem Studio",
   "title": "drawing",
   "url": "https://xemstudio.com/objects/grooved-heart-cam-mechanism/",
   "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": [
  "grooved-heart-cam-mechanism"
 ],
 "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 is a grooved heart cam?",
   "a": "Ø92 × 10 disc with a 10 mm wide, 6 mm deep groove in its face: the groove's centre line is a heart (radius 20 → 40 mm over 180° and back), so a Ø10 roller in it is driven both ways — no spring needed. Ø5 bore."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "grooved-heart-cam-r20-h20",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/grooved-heart-cam-r20-h20/grooved-heart-cam-r20-h20.step",
   "stl": "https://xemstudio.com/files/hardware/grooved-heart-cam-r20-h20/grooved-heart-cam-r20-h20.stl",
   "note": "face cam, groove on the top face"
  }
 ],
 "markdown": "https://xemstudio.com/objects/grooved-heart-cam-r20-h20/index.md"
}