{
 "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": "guide-pulley-right-angle-belt-mechanism",
 "name": "Belt drive between shafts at right angles with two guide pulleys",
 "kind": "hardware",
 "category": "Mechanisms",
 "group": "Belt and friction drives",
 "year": null,
 "question": "How do guide pulleys carry a belt round a right angle?",
 "tags": [
  "mechanism",
  "belt and friction drives",
  "kinematics",
  "507 mechanical movements"
 ],
 "aliases": [
  "guide pulley belt",
  "right angle belt drive",
  "mule pulley drive",
  "quarter turn belt with idlers",
  "transmisión en ángulo recto con poleas guía",
  "Winkeltrieb mit Leitrollen"
 ],
 "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/guide-pulley-right-angle-belt-mechanism/",
 "sheet_txt": "https://xemstudio.com/objects/guide-pulley-right-angle-belt-mechanism/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design following Brown No. 3 (1868)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Two pulleys on shafts at right angles, joined by one belt led over two guide pulleys on a single inclined shaft. Each strand lies in the mid-planes of both pulleys it joins, so the belt runs in either direction without leaving the faces.",
   "Here two Ø40 pulleys sit 80 mm apart on the common perpendicular, their belt lines all parallel; the guides (Ø28.28 = 20√2) are 100 mm beyond, on a shaft at 45° to both. Each strand twists 45°; belt 12 × 1.5, inside length 774.52 mm.",
   "Brown's No. 3 (guide pulleys carrying the belt between shafts at right angles); No. 4 does it with the belt alone, working one way only.",
   "Parts (each has its own page): plain-flat-pulley-40x12, plain-flat-pulley-28-28x12-bore6, flat-belt-12x1-5-right-angle-guide-drive, dowel-pins-metric.",
   "Brown's movement No. 3 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size."
  ],
  "table": {
   "columns": [
    "parameter",
    "value"
   ],
   "rows": [
    [
     "pulleys",
     "2 × Ø40 × 12, shafts at 90°"
    ],
    [
     "guide pulleys",
     "2 × Ø28.28 on one shaft at 45°"
    ],
    [
     "ratio",
     "1 : 1"
    ],
    [
     "belt",
     "12 × 1.5, 774.52 mm"
    ]
   ]
  }
 },
 "sheet_text": "Belt drive between shafts at right angles with two guide pulleys — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/guide-pulley-right-angle-belt-mechanism/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)\nBasis: Xem Studio design following Brown No. 3 (1868)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Two pulleys on shafts at right angles, joined by one belt led over two guide pulleys on a single inclined shaft. Each strand lies in the mid-planes of both pulleys it joins, so the belt runs in either direction without leaving the faces.\n- Here two Ø40 pulleys sit 80 mm apart on the common perpendicular, their belt lines all parallel; the guides (Ø28.28 = 20√2) are 100 mm beyond, on a shaft at 45° to both. Each strand twists 45°; belt 12 × 1.5, inside length 774.52 mm.\n- Brown's No. 3 (guide pulleys carrying the belt between shafts at right angles); No. 4 does it with the belt alone, working one way only.\n- Parts (each has its own page): plain-flat-pulley-40x12, plain-flat-pulley-28-28x12-bore6, flat-belt-12x1-5-right-angle-guide-drive, dowel-pins-metric.\n- Brown's movement No. 3 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.\n\nparameter  value\npulleys  2 × Ø40 × 12, shafts at 90°\nguide pulleys  2 × Ø28.28 on one shaft at 45°\nratio  1 : 1\nbelt  12 × 1.5, 774.52 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. 3: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_003.html\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/guide-pulley-right-angle-belt-mechanism/index.json\nAPI: https://xemstudio.com/api/geometry?object=guide-pulley-right-angle-belt-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. 3: figure, his text and an animation",
   "url": "https://507movements.com/mm_003.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": [
  "plain-flat-pulley-40x12",
  "plain-flat-pulley-28-28x12-bore6",
  "flat-belt-12x1-5-right-angle-guide-drive",
  "dowel-pins-metric"
 ],
 "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 do guide pulleys carry a belt round a right angle?",
   "a": "Two pulleys on shafts at right angles, joined by one belt led over two guide pulleys on a single inclined shaft. Each strand lies in the mid-planes of both pulleys it joins, so the belt runs in either direction without leaving the faces."
  }
 ],
 "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": "guide-pulley-right-angle-belt-mechanism-assembly",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/guide-pulley-right-angle-belt-mechanism/guide-pulley-right-angle-belt-mechanism-assembly.step",
   "stl": "https://xemstudio.com/files/hardware/guide-pulley-right-angle-belt-mechanism/guide-pulley-right-angle-belt-mechanism-assembly.stl",
   "note": "Assembled mechanism, all parts placed at one pose (STEP keeps each part separate)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/guide-pulley-right-angle-belt-mechanism/index.md"
}