{ "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-rd-engine-frame", "name": "Frame for the rolling-diaphragm tri-clamp engines: base, wall, hanger and torch-stand mount", "kind": "hardware", "category": "Hardware", "group": "Stirling & thermoacoustic", "year": null, "question": "What frame holds a 2 in tri-clamp engine over a torch?", "tags": [ "frame", "stand", "torch", "tri-clamp", "stirling", "long earth society" ], "aliases": [ "stirling engine frame tri clamp", "torch stirling stand" ], "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-rd-engine-frame/", "sheet_txt": "https://xemstudio.com/objects/tri-clamp-rd-engine-frame/sheet.txt", "sheet": { "basis": "Design values; hanger bar hole spacing (78.8) and height from the spool hanger collars on this site; torch-stand hole pattern from the torch stand on this site", "overall_mm": { "length": null, "width": null, "height": null }, "notes": [ "One frame for all three rolling-diaphragm engines: the 2 in cup hangs from a spool hanger bolted to the wall, its closed end 40 mm over the torch stand's ring.", "The wall has a window behind the hot end and the optional finned cooler, so the fins clear it and the flame has air.", "The base reaches 300 mm toward +X, under the power head and flywheel on the tee's branch." ], "table": { "columns": [ "feature", "value_mm" ], "rows": [ [ "base", "370 × 150 × 8" ], [ "wall", "124 × 10, top z 234.85" ], [ "hanger holes", "x ±39.4, z 226.85" ], [ "torch stand holes", "(±25, 28), M4" ], [ "cup bottom", 93 ] ] } }, "sheet_text": "Frame for the rolling-diaphragm tri-clamp engines: base, wall, hanger and torch-stand mount — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-rd-engine-frame/ (CC BY 4.0)\nBasis: Design values; hanger bar hole spacing (78.8) and height from the spool hanger collars on this site; torch-stand hole pattern from the torch stand on this site\nCatalog version: 2026-10-20\n\nSizes: see table below\n- One frame for all three rolling-diaphragm engines: the 2 in cup hangs from a spool hanger bolted to the wall, its closed end 40 mm over the torch stand's ring.\n- The wall has a window behind the hot end and the optional finned cooler, so the fins clear it and the flame has air.\n- The base reaches 300 mm toward +X, under the power head and flywheel on the tee's branch.\n\nfeature value_mm\nbase 370 × 150 × 8\nwall 124 × 10, top z 234.85\nhanger holes x ±39.4, z 226.85\ntorch stand holes (±25, 28), M4\ncup bottom 93.0\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\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-rd-engine-frame/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-rd-engine-frame\n", "sources": [ { "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": [ "spool-hanger-collars", "tri-clamp-torch-stand", "list-tri-clamp-rd-beta", "list-tri-clamp-rd-ringbom", "list-tri-clamp-rd-gamma" ], "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": "hanger-bar holes", "exact": "2 × Ø5.5", "mates": "M5 screws", "fit": "designed", "files": "all" }, { "feature": "torch-stand holes", "exact": "2 × Ø3.3", "mates": "M4 tap drill", "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": "Which engines use it?", "a": "The rolling-diaphragm beta, Ringbom and gamma: they share the cup, the hanger height and the torch position." } ], "files_license": null, "offers": [ { "file": "rd-frame-2in", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/tri-clamp-rd-engine-frame/rd-frame-2in.step", "stl": "https://xemstudio.com/files/hardware/tri-clamp-rd-engine-frame/rd-frame-2in.stl", "note": "frame: base 370 × 150 × 8 (x −70..300, y −95..55), wall x ±62, y -49.4..-39.4 to z 234.85 with a window x ±30 from z 93 to 217.85, 2 × Ø5.5 at x ±39.4, z 226.85 for the hanger bar, two gussets, 2 × M4 tapped (Ø3.3) at (±25, 28) for the torch stand" } ], "markdown": "https://xemstudio.com/objects/tri-clamp-rd-engine-frame/index.md" }