{
 "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": "tri-clamp-motor-mount-plate",
 "name": "Motor-mount plate for a 2 in tri-clamp cross: clamps between two faces, holds a 2208 gimbal motor inside",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "How do I mount a motor inside a sealed tri-clamp vessel?",
 "tags": [
  "motor mount",
  "plate",
  "generator",
  "sealed",
  "crankcase",
  "tri-clamp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "tri clamp motor mount",
  "motor inside tri clamp",
  "sealed generator motor mount",
  "gimbal motor mount plate"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/tri-clamp-motor-mount-plate/",
 "sheet_txt": "https://xemstudio.com/objects/tri-clamp-motor-mount-plate/sheet.txt",
 "sheet": {
  "basis": "ISO 2852 face and 20° back on both sides as the clamp-in bearing plate on this site (16 mm face to face for two standard clamps); motor base holes (4-M3 on 19 × 16) from the 2208 listing; ISO 273 medium clearance for M3 and ISO 10642 countersink (90°, Ø6)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A ring clamped between the cross's top face and the port cap, like a thick gasket, each side its own Type B gasket and clamp. Its Ø30 bore lets the gas and the motor's three leads through to the port cap.",
   "From the ring a column hangs down the cross's top run to a mount face 62.1 mm below the plate. The motor's base bolts to it with four M3 × 6 countersunk screws whose heads sit flush, because the top run leaves no room for heads behind the face. The holes follow the motor's 16 and 19 mm pairs, turned 45° so the face stays inside the Ø47.5 bore.",
   "Everything stays inside the bore and inside the gasket lip (Ø45.3) where it passes the joint. The motor hangs over the crank, its axis parallel to the crankshaft, its pinion in mesh with the crank gear."
  ],
  "table": {
   "columns": [
    "feature",
    "value"
   ],
   "rows": [
    [
     "faces",
     "ISO 2852 both sides, 2 in"
    ],
    [
     "face to face",
     16
    ],
    [
     "bore",
     "Ø30"
    ],
    [
     "column",
     "x 6–21, |y| ≤ 7"
    ],
    [
     "mount face",
     "3 thick, |y| ≤ 12, 4 × Ø3.4 csk Ø6 × 90°"
    ],
    [
     "motor axis below the inner face",
     62.1
    ]
   ]
  }
 },
 "sheet_text": "Motor-mount plate for a 2 in tri-clamp cross: clamps between two faces, holds a 2208 gimbal motor inside — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-motor-mount-plate/  (CC BY 4.0)\nBasis: ISO 2852 face and 20° back on both sides as the clamp-in bearing plate on this site (16 mm face to face for two standard clamps); motor base holes (4-M3 on 19 × 16) from the 2208 listing; ISO 273 medium clearance for M3 and ISO 10642 countersink (90°, Ø6)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A ring clamped between the cross's top face and the port cap, like a thick gasket, each side its own Type B gasket and clamp. Its Ø30 bore lets the gas and the motor's three leads through to the port cap.\n- From the ring a column hangs down the cross's top run to a mount face 62.1 mm below the plate. The motor's base bolts to it with four M3 × 6 countersunk screws whose heads sit flush, because the top run leaves no room for heads behind the face. The holes follow the motor's 16 and 19 mm pairs, turned 45° so the face stays inside the Ø47.5 bore.\n- Everything stays inside the bore and inside the gasket lip (Ø45.3) where it passes the joint. The motor hangs over the crank, its axis parallel to the crankshaft, its pinion in mesh with the crank gear.\n\nfeature  value\nfaces  ISO 2852 both sides, 2 in\nface to face  16.0\nbore  Ø30\ncolumn  x 6–21, |y| ≤ 7\nmount face  3 thick, |y| ≤ 12, 4 × Ø3.4 csk Ø6 × 90°\nmotor axis below the inner face  62.1\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- ISO (via iTeh sample): ISO 2852 clamp liners: face profile and flange / groove diameters — PDF — standard excerpt; dimensions are facts — https://cdn.standards.iteh.ai/samples/7850/eb49c396488d408c8ced3e2961d76cf3/ISO-2852-1974.pdf\n- ASME: BPE Bioprocessing Equipment (clamp fitting dimensions, tube OD and wall) — standard — ASME; dimensions are facts [verify license at link] — https://www.asme.org/codes-standards/find-codes-standards/bpe-bioprocessing-equipment\n- ISO: ISO 273 clearance holes for bolts and screws (fine / medium / coarse) — standard — dimensions are facts [verify license at link] — https://www.iso.org/standard/4196.html\n- GetFPV (product listing): Tiger GB2208-80 gimbal motor: 27.5 × 23, 4.5 hollow shaft, stator 4-M3 on 19 × 16, rotor 4-M2 on 12 × 12 — web — vendor page; dimensions are facts [verify license at link] — https://www.getfpv.com/tiger-gb2208-80-brushless-gimbal-motor-hollow-shaft.html\n- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/tri-clamp-motor-mount-plate/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-motor-mount-plate\n",
 "sources": [
  {
   "publisher": "ISO (via iTeh sample)",
   "title": "ISO 2852 clamp liners: face profile and flange / groove diameters",
   "url": "https://cdn.standards.iteh.ai/samples/7850/eb49c396488d408c8ced3e2961d76cf3/ISO-2852-1974.pdf",
   "formats": [
    "PDF"
   ],
   "license": "standard excerpt; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "ASME",
   "title": "BPE Bioprocessing Equipment (clamp fitting dimensions, tube OD and wall)",
   "url": "https://www.asme.org/codes-standards/find-codes-standards/bpe-bioprocessing-equipment",
   "formats": [
    "standard"
   ],
   "license": "ASME; dimensions are facts",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "ISO",
   "title": "ISO 273 clearance holes for bolts and screws (fine / medium / coarse)",
   "url": "https://www.iso.org/standard/4196.html",
   "formats": [
    "standard"
   ],
   "license": "dimensions are facts",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "GetFPV (product listing)",
   "title": "Tiger GB2208-80 gimbal motor: 27.5 × 23, 4.5 hollow shaft, stator 4-M3 on 19 × 16, rotor 4-M2 on 12 × 12",
   "url": "https://www.getfpv.com/tiger-gb2208-80-brushless-gimbal-motor-hollow-shaft.html",
   "formats": [
    "web"
   ],
   "license": "vendor page; dimensions are facts",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine builds",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "gimbal-motor-2208-envelope",
  "tri-clamp-generator-step-up-gears",
  "tri-clamp-clamp-in-bearing-plate",
  "tri-clamp-port-cap",
  "list-tri-clamp-sealed-diaphragm-generator"
 ],
 "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": [
  {
   "feature": "faces",
   "exact": "ISO 2852 both sides (land Ø56.5–Ø64, rim 2.85, 1.6 recess, 20° back to Ø50.8)",
   "mates": "standard clamps + Type B gaskets",
   "fit": "clamp",
   "files": "all"
  },
  {
   "feature": "mount face holes",
   "exact": "4 × Ø3.4, 90° countersink Ø6, 16 / 19 pattern turned 45°",
   "mates": "csk-m3x6 into the motor base",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "mount face",
   "exact": "flat, x 15 from the cross axis",
   "mates": "2208 motor base",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "bore",
   "exact": "Ø30",
   "mates": "gas and the motor leads to the port cap",
   "fit": "designed",
   "files": "all"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. Typical FDM: hole +0.0 to +0.1 mm on diameter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. Typical FDM: +0.2 mm.",
  "run": "turns or slides in use: pin in a link, rod through a guide. Typical FDM: +0.3 mm.",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. Typical FDM: +0.3 mm.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "Why does the mount hang from the top joint?",
   "a": "The top joint is the only face of the cross above the crank; the motor has to sit over the crank so its gear can reach the crankshaft."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "motor-mount-plate-2in-2208",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/tri-clamp-motor-mount-plate/motor-mount-plate-2in-2208.step",
   "stl": "https://xemstudio.com/files/hardware/tri-clamp-motor-mount-plate/motor-mount-plate-2in-2208.stl",
   "note": "motor-mount plate: ISO 2852 face and 20° back on both sides, 16 face to face, Ø30 bore; column x 6–21, |y| ≤ 7 hanging 47.3 below the inner face; mount face x 15–18, |y| ≤ 12, 4 × Ø3.4 countersunk 90° to Ø6 with a 0.2 rim (ISO 10642 head) on the 16 / 19 pattern turned 45°, Ø8 centre relief; motor axis 62.1 below the inner face"
  }
 ],
 "markdown": "https://xemstudio.com/objects/tri-clamp-motor-mount-plate/index.md"
}