Roller-follower fork rod, 8 × 6 mm, for a Ø10 roller on a Ø3 pin — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/roller-follower-fork-rod-8/  (CC BY 4.0)
Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
Catalog version: 2026-10-20

Overall (mm): length 14.0, width 75.0, height 10.0
- 8 × 10 mm rod ending in a clevis: two 2 mm cheeks, 6 mm apart (the cam's thickness), pass above and below the cam and carry a Ø3 pin on which the Ø10 × 4 roller turns in the cam's plane.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
rod  8 × 10 mm, 60 long
cheeks  2 mm, 6 mm apart
roller  Ø10 × 4 (roller-follower-10)
pin  Ø3

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. 138: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_138.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/plate-cam-roller-follower-mechanism/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/roller-follower-fork-rod-8/index.json
API: https://xemstudio.com/api/geometry?object=roller-follower-fork-rod-8