{
 "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": "mug-ltd-bottom-plate",
 "name": "Mug LTD bottom plate Ø90 × 6 (sits on an 11 oz mug)",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Stirling & thermoacoustic",
 "year": null,
 "question": "What size plate does a Stirling engine need to sit on a coffee mug?",
 "tags": [
  "ltd",
  "low temperature differential",
  "coffee mug",
  "plate",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "coffee mug stirling engine plate",
  "mug stirling engine size",
  "ltd stirling hot plate 90mm"
 ],
 "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/mug-ltd-bottom-plate/",
 "sheet_txt": "https://xemstudio.com/objects/mug-ltd-bottom-plate/sheet.txt",
 "sheet": {
  "basis": "Ø90 chosen to sit on an 11 oz mug (rim Ø82.55 = 3.25 in, listing cited) with 3.7 mm overhang; proportions scaled from the LTD kit",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Ø90 × 6 hot plate. The 11 oz mug's rim is Ø82.55 (3.25 in); the plate overhangs it by 3.7 mm all round and its underside is flat: the chamber screws go into M3 tapped holes (Ø2.5 tap drill, through) and stop 2 mm above the underside, so nothing stands proud where the plate rests on the rim.",
   "5 × M3 tapped on R41 at 60°, 120°, 180°, 240° and 300° (0° is under the syringe socket); the chamber ring and the top plate stack on it (ring 23, top plate 3) and five M3 × 30 from the top plate reach 4 mm into it."
  ],
  "table": {
   "columns": [
    "feature",
    "size_mm"
   ],
   "rows": [
    [
     "plate",
     "Ø90 × 6"
    ],
    [
     "screw circle",
     "R41, 5 × M3 tapped Ø2.5"
    ],
    [
     "mug rim (11 oz)",
     "Ø82.55"
    ]
   ]
  }
 },
 "sheet_text": "Mug LTD bottom plate Ø90 × 6 (sits on an 11 oz mug) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/mug-ltd-bottom-plate/  (CC BY 4.0)\nBasis: Ø90 chosen to sit on an 11 oz mug (rim Ø82.55 = 3.25 in, listing cited) with 3.7 mm overhang; proportions scaled from the LTD kit\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Ø90 × 6 hot plate. The 11 oz mug's rim is Ø82.55 (3.25 in); the plate overhangs it by 3.7 mm all round and its underside is flat: the chamber screws go into M3 tapped holes (Ø2.5 tap drill, through) and stop 2 mm above the underside, so nothing stands proud where the plate rests on the rim.\n- 5 × M3 tapped on R41 at 60°, 120°, 180°, 240° and 300° (0° is under the syringe socket); the chamber ring and the top plate stack on it (ring 23, top plate 3) and five M3 × 30 from the top plate reach 4 mm into it.\n\nfeature  size_mm\nplate  Ø90 × 6\nscrew circle  R41, 5 × M3 tapped Ø2.5\nmug rim (11 oz)  Ø82.55\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Atlanta Vinyl Store: Premium 11 oz sublimation mug: 3.75 in H × 3.25 in D — web — listing [verify license at link] — https://atlantavinylstore.com/products/premium-11oz-sublimation-mugs\n- James R. Senft: An Introduction to Low Temperature Differential Stirling Engines — book — Moriya Press [verify license at link] — https://www.stirlingengine.com/\n- Wikipedia: Stirling engine — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Stirling_engine\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/mug-ltd-bottom-plate/index.json\nAPI: https://xemstudio.com/api/geometry?object=mug-ltd-bottom-plate\n",
 "sources": [
  {
   "publisher": "Atlanta Vinyl Store",
   "title": "Premium 11 oz sublimation mug: 3.75 in H × 3.25 in D",
   "url": "https://atlantavinylstore.com/products/premium-11oz-sublimation-mugs",
   "formats": [
    "web"
   ],
   "license": "listing",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "James R. Senft",
   "title": "An Introduction to Low Temperature Differential Stirling Engines",
   "url": "https://www.stirlingengine.com/",
   "formats": [
    "book"
   ],
   "license": "Moriya Press",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Stirling engine",
   "url": "https://en.wikipedia.org/wiki/Stirling_engine",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "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": [
  "list-ltd-mug",
  "ltd-bottom-plate",
  "ltd-top-plate",
  "glass-syringes"
 ],
 "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": "chamber screw holes",
   "exact": "Ø2.5 (M3 tapped), 5 on R41",
   "mates": "shcs-m3x30",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "underside on the mug rim",
   "exact": "Ø90 flat on an Ø82.55 rim",
   "mates": "11 oz mug (found object)",
   "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": "Will a Ø90 plate sit on a coffee mug?",
   "a": "On an 11 oz mug (rim Ø82.55) yes, with 3.7 mm overhang; 15 oz mugs are wider, so measure yours."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "mug-ltd-bottom-plate-90",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/mug-ltd-bottom-plate/mug-ltd-bottom-plate-90.step",
   "stl": "https://xemstudio.com/files/hardware/mug-ltd-bottom-plate/mug-ltd-bottom-plate-90.stl",
   "note": "bottom (hot) plate Ø90 × 6, 5 × M3 tapped (Ø2.5) through on R41 at 60°, 120°, 180°, 240°, 300°; rests on an 11 oz mug rim (Ø82.55)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/mug-ltd-bottom-plate/index.md"
}