{
 "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": "mutilated-pinion-m1-20t-half",
 "name": "Mutilated pinion, module 1, 20 T with 10 teeth kept (half)",
 "kind": "modern",
 "category": "Hardware",
 "group": "Mechanism parts",
 "year": null,
 "question": "What is a mutilated gear?",
 "tags": [
  "mechanism part",
  "507 mechanical movements"
 ],
 "aliases": [
  "mutilated gear",
  "partial gear",
  "intermittent gear",
  "engranaje mutilado",
  "Teilzahnrad"
 ],
 "overall_mm": {
  "length": 21.99,
  "width": 19.74,
  "height": 8
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/mutilated-pinion-m1-20t-half/",
 "sheet_txt": "https://xemstudio.com/objects/mutilated-pinion-m1-20t-half/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design following Brown's figure (1868); true size, no printing allowance",
  "overall_mm": {
   "length": 21.99,
   "width": 19.74,
   "height": 8
  },
  "notes": [
   "A module 1, 20-tooth spur gear (catalog gear, Ø6 bore, 8 face) with the teeth of one half cut away to the root circle (Ø17.5): it drives for half a turn and is idle for the other half.",
   "Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features)."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "module",
     "1"
    ],
    [
     "teeth",
     "10 of 20 (180°)"
    ],
    [
     "root Ø (cut half)",
     "17.5 mm"
    ],
    [
     "bore",
     "Ø6"
    ]
   ]
  }
 },
 "sheet_text": "Mutilated pinion, module 1, 20 T with 10 teeth kept (half) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/mutilated-pinion-m1-20t-half/  (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 21.99, width 19.74, height 8.0\n- A module 1, 20-tooth spur gear (catalog gear, Ø6 bore, 8 face) with the teeth of one half cut away to the root circle (Ø17.5): it drives for half a turn and is idle for the other half.\n- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).\n\ndimension  value\nmodule  1\nteeth  10 of 20 (180°)\nroot Ø (cut half)  17.5 mm\nbore  Ø6\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. 114: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_114.html\n- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/mutilated-gear-double-rack-mechanism/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/mutilated-pinion-m1-20t-half/index.json\nAPI: https://xemstudio.com/api/geometry?object=mutilated-pinion-m1-20t-half\n",
 "sources": [
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   "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. 114: figure, his text and an animation",
   "url": "https://507movements.com/mm_114.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/mutilated-gear-double-rack-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": [
  "mutilated-gear-double-rack-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 mutilated gear?",
   "a": "A module 1, 20-tooth spur gear (catalog gear, Ø6 bore, 8 face) with the teeth of one half cut away to the root circle (Ø17.5): it drives for half a turn and is idle for the other half."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "mutilated-pinion-m1-20t",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/mutilated-pinion-m1-20t-half/mutilated-pinion-m1-20t.step",
   "stl": "https://xemstudio.com/files/hardware/mutilated-pinion-m1-20t-half/mutilated-pinion-m1-20t.stl",
   "note": "mutilated pinion, teeth on the +Y half"
  }
 ],
 "markdown": "https://xemstudio.com/objects/mutilated-pinion-m1-20t-half/index.md"
}