{ "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": "beam-pivot-post", "name": "Beam pivot post, 60 mm", "kind": "hardware", "category": "Stirling engines", "group": "Drives & mechanisms", "year": null, "question": "What holds the pivot of a rocker beam on a Stirling engine?", "tags": [ "pivot", "post", "rocker beam", "stirling", "long earth society" ], "aliases": [ "beam pivot post", "rocker pivot stand", "walking beam pivot" ], "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/beam-pivot-post/", "sheet_txt": "https://xemstudio.com/objects/beam-pivot-post/sheet.txt", "sheet": { "basis": "Ø3 pin hole (fit: press); M3 clearance Ø3.4 (ISO 273)", "overall_mm": { "length": null, "width": null, "height": null }, "notes": [ "A 16 × 10 upright 60 tall on a 30 × 16 × 4 foot.", "A Ø3 hole through the 10 mm upright, 54 mm up (fit: press), takes the pivot pin that the rocker beam's 623 turns on.", "Two Ø3.4 holes 22 mm apart in the foot take M3 screws to the base." ], "table": { "columns": [ "parameter", "value" ], "rows": [ [ "height", 60 ], [ "upright", "16 × 10" ], [ "foot", "30 × 16 × 4" ], [ "pin hole", "Ø3 at 54" ], [ "foot holes", "2 × Ø3.4 at 22" ] ] } }, "sheet_text": "Beam pivot post, 60 mm — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/beam-pivot-post/ (CC BY 4.0)\nBasis: Ø3 pin hole (fit: press); M3 clearance Ø3.4 (ISO 273)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A 16 × 10 upright 60 tall on a 30 × 16 × 4 foot.\n- A Ø3 hole through the 10 mm upright, 54 mm up (fit: press), takes the pivot pin that the rocker beam's 623 turns on.\n- Two Ø3.4 holes 22 mm apart in the foot take M3 screws to the base.\n\nparameter value\nheight 60\nupright 16 × 10\nfoot 30 × 16 × 4\npin hole Ø3 at 54\nfoot holes 2 × Ø3.4 at 22\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Beam engine — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Beam_engine\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/beam-pivot-post/index.json\nAPI: https://xemstudio.com/api/geometry?object=beam-pivot-post\n", "sources": [ { "publisher": "Wikipedia", "title": "Beam engine", "url": "https://en.wikipedia.org/wiki/Beam_engine", "formats": [ "web" ], "license": "CC BY-SA 4.0 (text)", "license_verified": true, "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": [ "rocker-beam", "tri-clamp-engine-base-plate", "dowel-pins-metric" ], "fits": [ { "role": "Goes in or on", "items": [ { "slug": "tri-clamp-engine-base-plate", "why": "2 × M3 to the base" } ] }, { "role": "Connects to", "items": [ { "slug": "rocker-beam", "why": "beam's 623 on the Ø3 pin" } ] }, { "role": "Also needed", "items": [ { "slug": "dowel-pins-metric", "why": "Ø3 pivot pin" } ] } ], "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": "pivot-post pin hole", "exact": "Ø3", "mates": "Ø3 pivot pin", "fit": "press", "files": "pivot-post-" }, { "feature": "pivot-post foot holes", "exact": "Ø3.4", "mates": "M3 screw clearance", "fit": "designed", "files": "pivot-post-" } ], "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": "How high is the beam pivot?", "a": "54 mm above the foot's underside." }, { "q": "What pin goes in the pivot post?", "a": "A Ø3 pin pressed in the hole; the rocker beam's 623 turns on it." } ], "files_license": null, "offers": [ { "file": "pivot-post-60", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/gamma-base-plate-and-beam/pivot-post-60.step", "stl": "https://xemstudio.com/files/hardware/gamma-base-plate-and-beam/pivot-post-60.stl", "note": "beam pivot post 60 mm, Ø3 pin hole (exact), 2 × M3 clearance (Ø3.4) foot" } ], "markdown": "https://xemstudio.com/objects/beam-pivot-post/index.md" }