Linear alternator module spools: 2 in × 42 mm bored Ø48.00 and 2 in × 25.4 mm (fabrication spec) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/linear-alternator-module-spools-2in/  (CC BY 4.0)
Basis: Fabrication specs on standard 2 in ferrules (ISO 2852 faces as gen_hardware draws them, BPE tube Ø50.8 × 1.65); lengths set by the module's stroke, the leaves' joints and two high-pressure clamps per spool
Catalog version: 2026-10-20

Sizes: see table below
- Two plain custom spools, both full 2 in sanitary fittings with a standard ferrule face at each end. With the catalog's stock 2 in × 3 in spool bored Ø48.00 between them they make the body of my linear alternator module: face A — 42 bored — leaf 1 — 3 in bored — leaf 2 — 25.4 — face B.
- 42 mm spool, bored: the bore opened from Ø47.5 to Ø48.00 end to end and finished as a running bore (wall 1.40). It is the piston's cylinder: the cup's 24 mm land runs in it as a clearance seal. Spec line: '2 in × 42 mm clamp × clamp spool, tube Ø50.8 × 1.65, bore finished Ø48.00 through'.
- 25.4 mm spool: two 0.5 in (12.7 mm) short weld ferrules welded back to back, nothing else: room for leaf 2's hub and collar to travel ±6 mm. Spec line: '2 in × 25.4 mm clamp × clamp spool, two short ferrules'.
- Both are as short as two high-pressure clamps side by side allow: each clamp needs about 10 mm either side of its joint plane. Hoop stress at the 15 bar gauge relief setting: 27.5 MPa in the 1.40 bored wall, 23.0 MPa in the plain tube; the builder checks that against what the spools are made of.

spool  face_to_face_mm  bore_mm  wall_mm  faces  made from
spool-2in-42mm-bored-48.00  42  48.00 (finished)  1.4  ISO 2852 2 in, both  two ferrules + tube, bored
spool-2in-25.4mm  25.4  47.5 (as made)  1.65  ISO 2852 2 in, both  two 12.7 short weld ferrules

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- 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
- 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
- Xem Studio: tools/gen_la_module.py: the module's geometry, masses, bounce volume, natural frequencies and every number on these pages — code — CC BY 4.0 — https://xemstudio.com/
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/linear-alternator-module-spools-2in/index.json
API: https://xemstudio.com/api/geometry?object=linear-alternator-module-spools-2in