Alpha V-twin frame for two 10 mL syringes at 90° — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/alpha-v-twin-syringe-frame/  (CC BY 4.0)
Basis: Computed in the generator: crank throw 8, rod 60, 10 mL barrel 15.9 OD / 14.5 ID; checked over a full turn
Catalog version: 2026-10-20

Sizes: see table below
- The one-piece frame of the two-syringe alpha: 140 × 52.45 × 128. A Ø24 boss holds the Ø5 crankshaft in two 625 bearings (Ø16 pockets at both ends, fit: press) with a Ø5.6 passage between.
- Two Ø15.9 barrel sockets (fit: socket) at ±45°, their axes meeting at the crank axis; the 90° between them is the alpha phase, with both con-rods on one crank pin.
- Socket inner faces at R45 from the crank axis: the piston skirt comes no closer than R43.4, so it never leaves the barrel. M3 pinch screws in Ø2.5 holes; foot with 2 × Ø5.5 at 50 mm for M5 into 2020.

parameter  value
outline  140 × 52.45 × 128
V angle  90°
barrel sockets  2 × Ø15.9 at ±45°
socket inner face  R45
min skirt radius  43.4
bearing pockets  2 × Ø16 (625)
foot  2 × Ø5.5 at 50

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/
- Wikipedia: Stirling engine (alpha configuration) — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Stirling_engine

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/alpha-v-twin-syringe-frame/index.json
API: https://xemstudio.com/api/geometry?object=alpha-v-twin-syringe-frame