{
 "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": "rolling-ruler-blade-200-d18",
 "name": "Rolling parallel ruler blade 200 × 24 × 6 with lugs for a Ø3 axle",
 "kind": "modern",
 "category": "Hardware",
 "group": "Mechanism parts",
 "year": null,
 "question": "What is a rolling parallel ruler blade?",
 "tags": [
  "mechanism part",
  "507 mechanical movements"
 ],
 "aliases": [
  "rolling ruler blade",
  "parallel ruler blade",
  "regla paralela de rodillos",
  "Rollparallellineal"
 ],
 "overall_mm": {
  "length": 200,
  "width": 24,
  "height": 13
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/rolling-ruler-blade-200-d18/",
 "sheet_txt": "https://xemstudio.com/objects/rolling-ruler-blade-200-d18/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design following Brown's figure (1868); true size, no printing allowance",
  "overall_mm": {
   "length": 200,
   "width": 24,
   "height": 13
  },
  "notes": [
   "200 × 24 × 6 straight-edge with four lugs holding a Ø3 axle 8 mm above its underside and two 5 × 20 openings at x = ±60 (5 along the blade) through which the Ø18 rollers reach 1 mm below the blade; the rollers' rims do the guiding, the blade's long edges do the drawing.",
   "Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features)."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "blade",
     "200 × 24 × 6 mm"
    ],
    [
     "axle holes",
     "Ø3, centre 8 mm above the underside"
    ],
    [
     "roller openings",
     "2 × 5 × 20 mm at x = ±60"
    ],
    [
     "lugs",
     "4 × 6 × 10 × 7 mm"
    ]
   ]
  }
 },
 "sheet_text": "Rolling parallel ruler blade 200 × 24 × 6 with lugs for a Ø3 axle — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/rolling-ruler-blade-200-d18/  (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 200.0, width 24.0, height 13.0\n- 200 × 24 × 6 straight-edge with four lugs holding a Ø3 axle 8 mm above its underside and two 5 × 20 openings at x = ±60 (5 along the blade) through which the Ø18 rollers reach 1 mm below the blade; the rollers' rims do the guiding, the blade's long edges do the drawing.\n- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).\n\ndimension  value\nblade  200 × 24 × 6 mm\naxle holes  Ø3, centre 8 mm above the underside\nroller openings  2 × 5 × 20 mm at x = ±60\nlugs  4 × 6 × 10 × 7 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. 323: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_323.html\n- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/rolling-parallel-ruler-mechanism/\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/rolling-ruler-blade-200-d18/index.json\nAPI: https://xemstudio.com/api/geometry?object=rolling-ruler-blade-200-d18\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. 323: figure, his text and an animation",
   "url": "https://507movements.com/mm_323.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/rolling-parallel-ruler-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": [
  "rolling-parallel-ruler-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 rolling parallel ruler blade?",
   "a": "200 × 24 × 6 straight-edge with four lugs holding a Ø3 axle 8 mm above its underside and two 5 × 20 openings at x = ±60 (5 along the blade) through which the Ø18 rollers reach 1 mm below the blade; the rollers' rims do the guiding, the blade's long edges do the drawing."
  }
 ],
 "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": "rolling-ruler-blade-200-d18",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/rolling-ruler-blade-200-d18/rolling-ruler-blade-200-d18.step",
   "stl": "https://xemstudio.com/files/hardware/rolling-ruler-blade-200-d18/rolling-ruler-blade-200-d18.stl",
   "note": "blade, z 0..6, lugs to z 13, axle along X at z = 8"
  }
 ],
 "markdown": "https://xemstudio.com/objects/rolling-ruler-blade-200-d18/index.md"
}