{
 "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": "planet-carrier-3x-r21",
 "name": "Planet carrier for three planets on a 21 mm radius (Ø52 × 5)",
 "kind": "modern",
 "category": "Hardware",
 "group": "Mechanism parts",
 "year": null,
 "question": "What is a planet carrier?",
 "tags": [
  "mechanism part",
  "507 mechanical movements"
 ],
 "aliases": [
  "planet carrier",
  "planetary carrier",
  "carrier plate",
  "portasatélites",
  "Planetenträger"
 ],
 "overall_mm": {
  "length": 52,
  "width": 52,
  "height": 5
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/planet-carrier-3x-r21/",
 "sheet_txt": "https://xemstudio.com/objects/planet-carrier-3x-r21/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design following Brown's figure (1868); true size, no printing allowance",
  "overall_mm": {
   "length": 52,
   "width": 52,
   "height": 5
  },
  "notes": [
   "Ø52 × 5 plate with a Ø8 centre bore (turns on the sun's Ø8 shaft) and three Ø5 holes 120° apart on a 21 mm radius for the planet axles (Ø5 dowels): carries 18-tooth planets around a 24-tooth sun inside a 60-tooth ring at module 1.",
   "Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features)."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "plate",
     "Ø52 × 5 mm"
    ],
    [
     "centre bore",
     "Ø8"
    ],
    [
     "planet holes",
     "3 × Ø5 on R21"
    ]
   ]
  }
 },
 "sheet_text": "Planet carrier for three planets on a 21 mm radius (Ø52 × 5) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/planet-carrier-3x-r21/  (CC BY 4.0)\nBasis: Xem Studio design following Brown's figure (1868); true size, no printing allowance\nCatalog version: 2026-10-20\n\nOverall (mm): length 52.0, width 52.0, height 5.0\n- Ø52 × 5 plate with a Ø8 centre bore (turns on the sun's Ø8 shaft) and three Ø5 holes 120° apart on a 21 mm radius for the planet axles (Ø5 dowels): carries 18-tooth planets around a 24-tooth sun inside a 60-tooth ring at module 1.\n- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).\n\ndimension  value\nplate  Ø52 × 5 mm\ncentre bore  Ø8\nplanet holes  3 × Ø5 on R21\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. 502: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_502.html\n- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/epicyclic-gear-train-mechanism/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/planet-carrier-3x-r21/index.json\nAPI: https://xemstudio.com/api/geometry?object=planet-carrier-3x-r21\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. 502: figure, his text and an animation",
   "url": "https://507movements.com/mm_502.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/epicyclic-gear-train-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": [
  "epicyclic-gear-train-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 planet carrier?",
   "a": "Ø52 × 5 plate with a Ø8 centre bore (turns on the sun's Ø8 shaft) and three Ø5 holes 120° apart on a 21 mm radius for the planet axles (Ø5 dowels): carries 18-tooth planets around a 24-tooth sun inside a 60-tooth ring at module 1."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "planet-carrier-3x-r21",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/planet-carrier-3x-r21/planet-carrier-3x-r21.step",
   "stl": "https://xemstudio.com/files/hardware/planet-carrier-3x-r21/planet-carrier-3x-r21.stl",
   "note": "carrier plate, z 0..5"
  }
 ],
 "markdown": "https://xemstudio.com/objects/planet-carrier-3x-r21/index.md"
}