{
 "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": "sun-and-planet-arm-30",
 "name": "Sun-and-planet arm, 30 mm centres, Ø10 holes",
 "kind": "modern",
 "category": "Hardware",
 "group": "Mechanism parts",
 "year": null,
 "question": "What does the arm in a sun-and-planet gear do?",
 "tags": [
  "mechanism part",
  "507 mechanical movements"
 ],
 "aliases": [
  "sun and planet arm",
  "planet arm",
  "brazo de sol y planeta",
  "Sonnen-und-Planeten-Arm"
 ],
 "overall_mm": {
  "length": 48,
  "width": 18,
  "height": 5
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/sun-and-planet-arm-30/",
 "sheet_txt": "https://xemstudio.com/objects/sun-and-planet-arm-30/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design following Brown's figure (1868); true size, no printing allowance",
  "overall_mm": {
   "length": 48,
   "width": 18,
   "height": 5
  },
  "notes": [
   "18 × 5 mm arm with two Ø10 holes 30 mm apart: it turns on the sun's Ø10 shaft and on the planet's boss and only keeps the two gears in mesh (centre distance 30 mm for two module 1, 30-tooth gears).",
   "Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features)."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "centres",
     "30 mm"
    ],
    [
     "holes",
     "2 × Ø10"
    ],
    [
     "section",
     "18 × 5 mm"
    ]
   ]
  }
 },
 "sheet_text": "Sun-and-planet arm, 30 mm centres, Ø10 holes — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/sun-and-planet-arm-30/  (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 48.0, width 18.0, height 5.0\n- 18 × 5 mm arm with two Ø10 holes 30 mm apart: it turns on the sun's Ø10 shaft and on the planet's boss and only keeps the two gears in mesh (centre distance 30 mm for two module 1, 30-tooth gears).\n- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).\n\ndimension  value\ncentres  30 mm\nholes  2 × Ø10\nsection  18 × 5 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. 39: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_039.html\n- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/sun-and-planet-gear-mechanism/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/sun-and-planet-arm-30/index.json\nAPI: https://xemstudio.com/api/geometry?object=sun-and-planet-arm-30\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. 39: figure, his text and an animation",
   "url": "https://507movements.com/mm_039.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/sun-and-planet-gear-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": [
  "sun-and-planet-gear-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 does the arm in a sun-and-planet gear do?",
   "a": "18 × 5 mm arm with two Ø10 holes 30 mm apart: it turns on the sun's Ø10 shaft and on the planet's boss and only keeps the two gears in mesh (centre distance 30 mm for two module 1, 30-tooth gears)."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "sun-and-planet-arm-30",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/sun-and-planet-arm-30/sun-and-planet-arm-30.step",
   "stl": "https://xemstudio.com/files/hardware/sun-and-planet-arm-30/sun-and-planet-arm-30.stl",
   "note": "arm, z 0..5"
  }
 ],
 "markdown": "https://xemstudio.com/objects/sun-and-planet-arm-30/index.md"
}