{ "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-bored-spool", "name": "Tri-clamp spool bored and honed: 2 in × 6 in, bore Ø48.00, a power-piston cylinder", "kind": "hardware", "category": "Hardware", "group": "Sanitary clamp fittings", "year": null, "question": "Can a tri-clamp spool be bored and honed as a piston cylinder?", "tags": [ "spool", "bored", "honed", "cylinder", "finished bore", "tri-clamp", "stirling", "long earth society" ], "aliases": [ "tri clamp spool bored", "honed tri clamp spool piston", "sanitary spool as cylinder", "2 inch spool bore 48" ], "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-bored-spool/", "sheet_txt": "https://xemstudio.com/objects/tri-clamp-bored-spool/sheet.txt", "sheet": { "basis": "Stock 2 in × 6 in spool (gen_hardware.tc_spool: ISO 2852 faces, Ø50.8 × 1.65 tube) with the bore finished to Ø48.00 over its whole length: the finished part is drawn as its own part", "overall_mm": { "length": null, "width": null, "height": null }, "notes": [ "A standard 2 in × 6 in spool with its bore opened from Ø47.5 to Ø48.00 end to end and finished as a running bore. The wall becomes 1.40 mm; the faces are untouched.", "On the free-piston generator the 48.00 bore is the power piston's clearance seal (the piston's 30 mm land runs in it) and the section of the vessel the alternator works through: the stator and coil sit outside the wall, so the vessel stays sealed and no wire passes through it.", "Hoop stress at the relief setting (15 bar gauge): 27.5 MPa. Do not clamp anything over the piston's seal zone: the generator hangs from the cooler spool S3." ], "table": { "columns": [ "feature", "value" ], "rows": [ [ "bore", "Ø48.00 × 152.4, running fit for the piston land" ], [ "wall", 1.3999999999999986 ], [ "faces", "ISO 2852, 2 in" ] ] } }, "sheet_text": "Tri-clamp spool bored and honed: 2 in × 6 in, bore Ø48.00, a power-piston cylinder — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/tri-clamp-bored-spool/ (CC BY 4.0)\nBasis: Stock 2 in × 6 in spool (gen_hardware.tc_spool: ISO 2852 faces, Ø50.8 × 1.65 tube) with the bore finished to Ø48.00 over its whole length: the finished part is drawn as its own part\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A standard 2 in × 6 in spool with its bore opened from Ø47.5 to Ø48.00 end to end and finished as a running bore. The wall becomes 1.40 mm; the faces are untouched.\n- On the free-piston generator the 48.00 bore is the power piston's clearance seal (the piston's 30 mm land runs in it) and the section of the vessel the alternator works through: the stator and coil sit outside the wall, so the vessel stays sealed and no wire passes through it.\n- Hoop stress at the relief setting (15 bar gauge): 27.5 MPa. Do not clamp anything over the piston's seal zone: the generator hangs from the cooler spool S3.\n\nfeature value\nbore Ø48.00 × 152.4, running fit for the piston land\nwall 1.3999999999999986\nfaces ISO 2852, 2 in\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 (tube OD and wall, clamp fittings) — standard — ASME; dimensions are facts [verify license at link] — https://www.asme.org/codes-standards/find-codes-standards/bpe-bioprocessing-equipment\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-bored-spool/index.json\nAPI: https://xemstudio.com/api/geometry?object=tri-clamp-bored-spool\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 (tube OD and wall, clamp fittings)", "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": "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": [ "tri-clamp-closed-end-spool", "fpse-power-piston", "fpse-linear-alternator-stator", "list-fpse-generator-2in" ], "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": "bore", "exact": "Ø48.00 × 152.4", "mates": "power piston seal land Ø48.00 × 30 (clearance seal)", "fit": "run", "files": "all" }, { "feature": "bore", "exact": "Ø48.00", "mates": "magnet carrier Ø47.0 (0.5 radial gap, no contact)", "fit": "designed", "files": "all" }, { "feature": "faces", "exact": "ISO 2852 2 in, both ends", "mates": "high-pressure clamps + half gaskets round leaves B and C", "fit": "clamp", "files": "all" }, { "feature": "tube OD", "exact": "Ø50.8", "mates": "stator pack teeth; hanger above the piston travel only", "fit": "clamp", "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 bore it to 48.00?", "a": "The as-made bore of sanitary tube is not a running surface. Opening it to one round, straight, finished diameter gives the piston a clearance seal; 48.00 cleans up the 47.5 nominal bore and leaves a 1.40 wall." } ], "files_license": null, "offers": [ { "file": "spool-2in-6in-bored-48.00", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/tri-clamp-bored-spool/spool-2in-6in-bored-48.00.step", "stl": "https://xemstudio.com/files/hardware/tri-clamp-bored-spool/spool-2in-6in-bored-48.00.stl", "note": "2 in × 6 in (152.4) spool, bore finished to Ø48.00 end to end (wall 1.40); ISO 2852 faces" } ], "markdown": "https://xemstudio.com/objects/tri-clamp-bored-spool/index.md" }