{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "constant-diameter-cam-c22-a6-b1-bore8",
 "name": "Constant-diameter cam for two Ø10 rollers 44 mm apart, 4 thick, Ø8 bore",
 "kind": "modern",
 "category": "Hardware",
 "group": "Mechanism parts",
 "year": null,
 "question": "What is a constant-diameter cam?",
 "tags": [
  "mechanism part",
  "507 mechanical movements"
 ],
 "aliases": [
  "constant diameter cam",
  "conjugate cam",
  "yoke cam",
  "cam between rollers",
  "leva de diámetro constante",
  "Gleichdickkurve (Kurvenscheibe zwischen Rollen)"
 ],
 "overall_mm": {
  "length": 34.42,
  "width": 34,
  "height": 4
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/constant-diameter-cam-c22-a6-b1-bore8/",
 "sheet_txt": "https://xemstudio.com/objects/constant-diameter-cam-c22-a6-b1-bore8/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design following Brown's figure (1868); true size, no printing allowance",
  "overall_mm": {
   "length": 34.42,
   "width": 34,
   "height": 4
  },
  "notes": [
   "Plate cam whose roller-centre (pitch) curve is r = 22 + 6 sin θ − sin 3θ: opposite radii always add up to 44 mm, so two rollers 44 mm apart on one yoke touch it at every angle and the yoke is driven both ways with no spring. The profile is the pitch curve offset inward by the 5 mm roller radius (no undercut). Stroke 14 mm.",
   "Only odd harmonics are allowed in such a curve (r(θ) + r(θ + 180°) = constant); the sin 3θ term flattens the ends of the motion.",
   "Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features)."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "pitch curve",
     "r = 22 + 6 sin θ − sin 3θ"
    ],
    [
     "roller centres",
     "44 mm apart"
    ],
    [
     "rollers",
     "Ø10 (623 bearings)"
    ],
    [
     "stroke",
     "14 mm"
    ],
    [
     "thickness",
     "4 mm"
    ],
    [
     "bore",
     "Ø8"
    ]
   ]
  }
 },
 "sheet_text": "Constant-diameter cam for two Ø10 rollers 44 mm apart, 4 thick, Ø8 bore — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/constant-diameter-cam-c22-a6-b1-bore8/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)\nBasis: Xem Studio design following Brown's figure (1868); true size, no printing allowance\nCatalog version: 2026-10-20\n\nOverall (mm): length 34.42, width 34.0, height 4.0\n- Plate cam whose roller-centre (pitch) curve is r = 22 + 6 sin θ − sin 3θ: opposite radii always add up to 44 mm, so two rollers 44 mm apart on one yoke touch it at every angle and the yoke is driven both ways with no spring. The profile is the pitch curve offset inward by the 5 mm roller radius (no undercut). Stroke 14 mm.\n- Only odd harmonics are allowed in such a curve (r(θ) + r(θ + 180°) = constant); the sin 3θ term flattens the ends of the motion.\n- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).\n\ndimension  value\npitch curve  r = 22 + 6 sin θ − sin 3θ\nroller centres  44 mm apart\nrollers  Ø10 (623 bearings)\nstroke  14 mm\nthickness  4 mm\nbore  Ø8\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. 117: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_117.html\n- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/cam-between-rollers-yoke-mechanism/\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/constant-diameter-cam-c22-a6-b1-bore8/index.json\nAPI: https://xemstudio.com/api/geometry?object=constant-diameter-cam-c22-a6-b1-bore8\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. 117: figure, his text and an animation",
   "url": "https://507movements.com/mm_117.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/cam-between-rollers-yoke-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": [
  "cam-between-rollers-yoke-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 constant-diameter cam?",
   "a": "Plate cam whose roller-centre (pitch) curve is r = 22 + 6 sin θ − sin 3θ: opposite radii always add up to 44 mm, so two rollers 44 mm apart on one yoke touch it at every angle and the yoke is driven both ways with no spring. The profile is the pitch curve offset inward by the 5 mm roller radius (no undercut). Stroke 14 mm."
  }
 ],
 "files_license": {
  "name": "Xem Studio Design License",
  "holder": "Xem Studio",
  "url": "https://xemstudio.com/license/",
  "note": "Xem Studio's own design: free to use, print, modify and sell things made from it; not to be republished or redistributed as files."
 },
 "offers": [
  {
   "file": "constant-diameter-cam-c22",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/constant-diameter-cam-c22-a6-b1-bore8/constant-diameter-cam-c22.step",
   "stl": "https://xemstudio.com/files/hardware/constant-diameter-cam-c22-a6-b1-bore8/constant-diameter-cam-c22.stl",
   "note": "cam, z 0..4, θ from +X"
  }
 ],
 "markdown": "https://xemstudio.com/objects/constant-diameter-cam-c22-a6-b1-bore8/index.md"
}