{
 "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": "cartwright-crosshead-30",
 "name": "Cartwright crosshead bar, 30 mm pin spacing, centre rod hole",
 "kind": "modern",
 "category": "Hardware",
 "group": "Mechanism parts",
 "year": null,
 "question": "What is the crosshead in Cartwright's parallel motion?",
 "tags": [
  "mechanism part",
  "507 mechanical movements"
 ],
 "aliases": [
  "crosshead bar",
  "cruceta",
  "Kreuzkopfsteg"
 ],
 "overall_mm": {
  "length": 40,
  "width": 10,
  "height": 5
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/cartwright-crosshead-30/",
 "sheet_txt": "https://xemstudio.com/objects/cartwright-crosshead-30/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design following Brown's figure (1868); true size, no printing allowance",
  "overall_mm": {
   "length": 40,
   "width": 10,
   "height": 5
  },
  "notes": [
   "40 × 10 × 5 bar with Ø3 holes at −15, 0 and +15 mm: the two connecting rods pin to the outer holes, the guided rod to the centre one, which moves on a straight line.",
   "Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features)."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "pin spacing",
     "30 mm"
    ],
    [
     "holes",
     "3 × Ø3"
    ],
    [
     "bar",
     "40 × 10 × 5 mm"
    ]
   ]
  }
 },
 "sheet_text": "Cartwright crosshead bar, 30 mm pin spacing, centre rod hole — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/cartwright-crosshead-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 40.0, width 10.0, height 5.0\n- 40 × 10 × 5 bar with Ø3 holes at −15, 0 and +15 mm: the two connecting rods pin to the outer holes, the guided rod to the centre one, which moves on a straight line.\n- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).\n\ndimension  value\npin spacing  30 mm\nholes  3 × Ø3\nbar  40 × 10 × 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. 328: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_328.html\n- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/cartwright-parallel-motion-mechanism/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/cartwright-crosshead-30/index.json\nAPI: https://xemstudio.com/api/geometry?object=cartwright-crosshead-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. 328: figure, his text and an animation",
   "url": "https://507movements.com/mm_328.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/cartwright-parallel-motion-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": [
  "cartwright-parallel-motion-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 crosshead in Cartwright's parallel motion?",
   "a": "40 × 10 × 5 bar with Ø3 holes at −15, 0 and +15 mm: the two connecting rods pin to the outer holes, the guided rod to the centre one, which moves on a straight line."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "cartwright-crosshead-30",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/cartwright-crosshead-30/cartwright-crosshead-30.step",
   "stl": "https://xemstudio.com/files/hardware/cartwright-crosshead-30/cartwright-crosshead-30.stl",
   "note": "crosshead bar, z 0..5"
  }
 ],
 "markdown": "https://xemstudio.com/objects/cartwright-crosshead-30/index.md"
}