Yoke 52 × 62.64 with a 40 mm wide opening and two 8 × 8 rods — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/constant-breadth-cam-yoke-40/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
Catalog version: 2026-10-20

Overall (mm): length 132.0, width 62.64, height 8.0
- Frame whose two inner faces are exactly 40 mm apart (the cam's breadth), opening 50.64 mm high, 8 thick, with an 8 × 8 rod 40 long on each side.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
opening  40 × 50.64 mm
rods  2 × 8 × 8 × 40
thickness  8 mm

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Henry T. Brown (1868, public domain): Five Hundred and Seven Mechanical Movements — scan on archive.org — web — Publisher's page; dimensions are facts — https://archive.org/details/fivehundredseven00browiala
- 507movements.com: Brown's movement No. 276: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_276.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/constant-breadth-cam-yoke-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/constant-breadth-cam-yoke-40/index.json
API: https://xemstudio.com/api/geometry?object=constant-breadth-cam-yoke-40