Linear alternator module open frame, 2 in: frame base, leaf seats, clamp rings, stator sleeve and top plate — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/linear-alternator-module-open-frame-2in/  (CC BY 4.0)
Basis: Design values, my geometry (tools/gen_la_module.py); the frame base's clamp face is the 2 in ISO 2852 end-cap profile drawn in tools/gen_hardware.py
Catalog version: 2026-10-20

Sizes: see table below
- Six parts that make the open frame of my linear alternator module. The frame base clamps on the 42 mm bored spool's second ferrule with a Type B gasket and a standard 2 in clamp, exactly as an end cap; everything else stacks on it with M3 screws, nothing around the sides: leaf 1 · lower clamp ring and its three posts · stator sleeve with the stator · top plate and its three posts · leaf-2 seat ring · leaf 2 · upper clamp ring.
- Each leaf's Ø64 rim sits in a Ø64 × 0.8 seat (the 0.8 leaf's thickness) and a flat Ø80 clamp ring presses it down, screws on r 36 outside the leaf, so no hole goes through a leaf. The rim is clamped inside r 23.75 = 47.5 / 2 exactly as in a spool joint, so the leaves' free span, stiffness and stress are the same as in the closed module. A 0.5 soft leaf sits on a 0.3 rim shim (tuning page).
- The stator sleeve keeps the alternator's magnetic gap: its Ø50.8 outside is where the stator teeth sit (as on the bored spool) and its Ø48.00 bore leaves the same 0.5 radial gap to the Ø47 magnet carrier, so the force constant, coil and side pull are the closed module's. The bobbin goes on over the Ø64 top flange before the packs; the lower Ø80 flange carries the sleeve on the lower posts.
- Screws: 3 × M3 × 25 down through the sleeve's lower flange, the 10 mm posts and the lower clamp ring into the frame base (7 engaged in its 7.5 mm tapped holes); 3 × M3 × 12 through the top plate into the sleeve's top flange; 3 × M3 × 16 through the upper clamp ring and the seat ring into the top plate's posts. Every tapped hole is drawn at the Ø2.5 M3 tap drill.
- The back of the piston is at the room's pressure: it breathes through the frame base's Ø47.5 bore, past leaf 1 and out of the 10 mm side opening between the lower clamp ring and the sleeve (1492 mm² at the bore circle against the piston's 1810 mm²).
- Every frame part is a flat ring or a round body with flat faces at both ends and no undercut; the slopes behind the base's neck and under the sleeve's top flange are 45°. Fits are in the table; everything else is drawn at size.

part  what it is  size_mm  fits  qty
la-frame-base-2in-ferrule  frame base (ferrule face, leaf-1 seat)  Ø80 × 28  ISO 2852 face: clamp; seat Ø64 × 0.8: clamp (leaf rim); bore Ø47.5: designed  1
la-frame-leaf-clamp-ring-80-posts10  lower leaf clamp ring with posts  Ø80 × 13  face on the leaf rim: clamp  1
la-frame-stator-sleeve-48x66  stator sleeve  Ø80 × 66, bore Ø48.00  OD Ø50.8: clamp (stator teeth); bore Ø48.00: designed (0.5 radial gap to the Ø47 carrier)  1
la-frame-stator-top-plate-80-posts5  stator top plate with posts  Ø80 × 10  faces: flat bolted joints  1
la-frame-leaf-seat-ring-80  leaf-2 seat ring  Ø80 × 4  seat Ø64 × 0.8: clamp (leaf rim)  1
la-frame-leaf-clamp-ring-80  upper leaf clamp ring  Ø80 × 3  face on the leaf rim: clamp  1

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- 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/
- Xem Studio: tools/gen_fpse_gen.py: the free-piston generator whose stator, magnets, leaves and collars this module reuses; its leaf frame model and magnetic-circuit estimate — code — CC BY 4.0 — https://xemstudio.com/
- 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
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 6 parts): https://xemstudio.com/files/hardware/linear-alternator-module-open-frame-2in/index.json
API: https://xemstudio.com/api/geometry?object=linear-alternator-module-open-frame-2in