Walking beam for a tri-clamp beam engine (arms 158.07 / 131.73) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/stirling-walking-beam/  (CC BY 4.0)
Basis: Design values; 625 and dowel sizes from their standards
Catalog version: 2026-10-20

Sizes: see table below
- A T-shaped beam on two 625 bearings on a Ø5 pivot pin in the post's cheeks. Arm A (158.62) carries a Ø6 pin for the 60 mm link from the piston rod's crosshead; arm B (132.18) a Ø5 pin for the 488.4 mm link down to the crank. The arm ratio 1.2 turns the crank's 30 mm throw into the piston's 36 mm stroke.

feature  value
arm A  158.62
arm B  132.18
pivot  Ø16 bore, two 625
swing  ±6.5°

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/

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