{
 "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": "tackle-block-10-advantage",
 "name": "Lower block for a pitch-Ø20 sheave with a standing-end arm (tackle rove to advantage)",
 "kind": "modern",
 "category": "Hardware",
 "group": "Mechanism parts",
 "year": null,
 "question": "What is the lower block for a pitch-ø20 sheave with a standing-end arm (tackle rove to advantage)?",
 "tags": [
  "mechanism part",
  "507 mechanical movements"
 ],
 "aliases": [
  "pulley block",
  "tackle block",
  "motón",
  "Flasche (Rollenblock)"
 ],
 "overall_mm": {
  "length": 68.7,
  "width": 13,
  "height": 43.2
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/tackle-block-10-advantage/",
 "sheet_txt": "https://xemstudio.com/objects/tackle-block-10-advantage/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design following Brown's figure (1868); true size, no printing allowance",
  "overall_mm": {
   "length": 68.7,
   "width": 13,
   "height": 43.2
  },
  "notes": [
   "Block frame: two 2 mm cheeks either side of the sheave (Ø4 pin holes), joined by bridges that carry Ø3 stems (into the beam, the floor plate or a weight's socket) and Ø3 rope-end sockets; every bridge sits clear of the rope's path. The arm carries the rope's standing end 50 mm to the side, so the hauling part can come off the moving block.",
   "Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features)."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "sheaves",
     "pitch Ø20 at (0, 0)"
    ],
    [
     "cheeks",
     "2 mm, 9 mm apart (8 mm sheaves)"
    ],
    [
     "pins",
     "Ø4"
    ],
    [
     "stems",
     "Ø3 × 8 at x = -16.67 down"
    ],
    [
     "rope sockets",
     "Ø3 × 5 at x = -50"
    ]
   ]
  }
 },
 "sheet_text": "Lower block for a pitch-Ø20 sheave with a standing-end arm (tackle rove to advantage) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tackle-block-10-advantage/  (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 68.7, width 13.0, height 43.2\n- Block frame: two 2 mm cheeks either side of the sheave (Ø4 pin holes), joined by bridges that carry Ø3 stems (into the beam, the floor plate or a weight's socket) and Ø3 rope-end sockets; every bridge sits clear of the rope's path. The arm carries the rope's standing end 50 mm to the side, so the hauling part can come off the moving block.\n- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).\n\ndimension  value\nsheaves  pitch Ø20 at (0, 0)\ncheeks  2 mm, 9 mm apart (8 mm sheaves)\npins  Ø4\nstems  Ø3 × 8 at x = -16.67 down\nrope sockets  Ø3 × 5 at x = -50\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. 12: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_012.html\n- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/tackle-rove-to-advantage-mechanism/\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/tackle-block-10-advantage/index.json\nAPI: https://xemstudio.com/api/geometry?object=tackle-block-10-advantage\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. 12: figure, his text and an animation",
   "url": "https://507movements.com/mm_012.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/tackle-rove-to-advantage-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": [
  "tackle-rove-to-advantage-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 the lower block for a pitch-ø20 sheave with a standing-end arm (tackle rove to advantage)?",
   "a": "Block frame: two 2 mm cheeks either side of the sheave (Ø4 pin holes), joined by bridges that carry Ø3 stems (into the beam, the floor plate or a weight's socket) and Ø3 rope-end sockets; every bridge sits clear of the rope's path. The arm carries the rope's standing end 50 mm to the side, so the hauling part can come off the moving block."
  }
 ],
 "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": "tackle-block-10-advantage",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/tackle-block-10-advantage/tackle-block-10-advantage.step",
   "stl": "https://xemstudio.com/files/hardware/tackle-block-10-advantage/tackle-block-10-advantage.stl",
   "note": "frame, sheave plane y = 0, coordinates as in the mechanism"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tackle-block-10-advantage/index.md"
}