Ross yoke alpha frame for two 10 mL syringes — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/ross-yoke-frame/  (CC BY 4.0)
Basis: Solved Ross linkage: barrel axes 40 apart, socket inner faces 63 above the crank axis, rocking-link post at (−40, 20); 625 pockets at the bearing OD
Catalog version: 2026-10-20

Sizes: see table below
- The one-piece frame of the Ross yoke alpha: 83 × 53.45 × 148. A Ø24 boss carries the Ø5 crankshaft in two 625 bearings (Ø16 pockets, fit: press) with a Ø5.6 passage between them.
- Two Ø15.9 barrel sockets (fit: socket) on parallel axes 40 mm apart; their inner faces sit 63 mm above the crank axis, where the syringe finger flanges seat. The lowest piston skirt comes to 62.1 mm, so the pistons never leave the barrels; M3 pinch screws in Ø2.5 holes.
- A post at (−40, 20) has a Ø3 hole (fit: press) for the rocking-link pin. The foot has 2 × Ø5.5 at 50 mm for M5 into a 2020 rail.

parameter  value
outline  83 × 53.45 × 148
barrel sockets  2 × Ø15.9, axes 40 apart
socket inner face  63 above crank axis
bearing pockets  2 × Ø16 (625)
rocking-link post  Ø3 at (−40, 20)
foot  2 × Ø5.5 at 50

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Ross yoke — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Ross_yoke
- 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/ross-yoke-frame/index.json
API: https://xemstudio.com/api/geometry?object=ross-yoke-frame