{
 "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": "friction-wheels-mechanism",
 "name": "Friction wheels (rolling contact drive), 30 : 60",
 "kind": "hardware",
 "category": "Mechanisms",
 "group": "Belt and friction drives",
 "year": null,
 "question": "How much torque can friction wheels transmit?",
 "tags": [
  "mechanism",
  "belt and friction drives",
  "kinematics",
  "507 mechanical movements"
 ],
 "aliases": [
  "friction drive",
  "friction wheels",
  "rolling contact drive",
  "ruedas de fricción",
  "Reibradgetriebe"
 ],
 "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/friction-wheels-mechanism/",
 "sheet_txt": "https://xemstudio.com/objects/friction-wheels-mechanism/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design following Brown No. 32 (1868)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Two plain wheels pressed together drive each other by friction at the line of contact: ratio = D₂/D₁ (2 : 1 here), opposite directions, and they slip instead of breaking when overloaded.",
   "Torque at the small wheel ≈ μ·F·R₁: with rubber on steel (μ ≈ 0.6) and 50 N pressing, about 0.45 N·m. Centre distance = (D₁ + D₂)/2 = 45 mm, rims touching.",
   "Brown's No. 32 (friction wheels with roughened or leather/rubber-covered rims).",
   "Parts (each has its own page): friction-wheel-30x10, friction-wheel-60x10.",
   "Brown's movement No. 32 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size."
  ],
  "table": {
   "columns": [
    "parameter",
    "value"
   ],
   "rows": [
    [
     "wheels",
     "Ø30 and Ø60 × 10"
    ],
    [
     "centre distance",
     "45 mm"
    ],
    [
     "ratio",
     "2 : 1"
    ]
   ]
  }
 },
 "sheet_text": "Friction wheels (rolling contact drive), 30 : 60 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/friction-wheels-mechanism/  (CC BY 4.0)\nBasis: Xem Studio design following Brown No. 32 (1868)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Two plain wheels pressed together drive each other by friction at the line of contact: ratio = D₂/D₁ (2 : 1 here), opposite directions, and they slip instead of breaking when overloaded.\n- Torque at the small wheel ≈ μ·F·R₁: with rubber on steel (μ ≈ 0.6) and 50 N pressing, about 0.45 N·m. Centre distance = (D₁ + D₂)/2 = 45 mm, rims touching.\n- Brown's No. 32 (friction wheels with roughened or leather/rubber-covered rims).\n- Parts (each has its own page): friction-wheel-30x10, friction-wheel-60x10.\n- Brown's movement No. 32 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.\n\nparameter  value\nwheels  Ø30 and Ø60 × 10\ncentre distance  45 mm\nratio  2 : 1\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. 32: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_032.html\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/friction-wheels-mechanism/index.json\nAPI: https://xemstudio.com/api/geometry?object=friction-wheels-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. 32: figure, his text and an animation",
   "url": "https://507movements.com/mm_032.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": [
  "friction-wheel-30x10",
  "friction-wheel-60x10"
 ],
 "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 much torque can friction wheels transmit?",
   "a": "Two plain wheels pressed together drive each other by friction at the line of contact: ratio = D₂/D₁ (2 : 1 here), opposite directions, and they slip instead of breaking when overloaded."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "friction-wheels-mechanism-assembly",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/friction-wheels-mechanism/friction-wheels-mechanism-assembly.step",
   "stl": "https://xemstudio.com/files/hardware/friction-wheels-mechanism/friction-wheels-mechanism-assembly.stl",
   "note": "Assembled mechanism, all parts placed at one pose (STEP keeps each part separate)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/friction-wheels-mechanism/index.md"
}