Governor arm 80 mm with a Ø24 ball, Ø3 pivot and link holes — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/governor-arm-80-ball-24/  (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 98.0, width 24.0, height 24.0
- 10 × 5 flat arm 45 mm long with a Ø3 pivot hole at the top and a Ø3 hole 40 mm down for the link to the sleeve, continued by a Ø4 rod that carries a Ø24 ball 80 mm from the pivot (the rod's end stands 1 mm out of the ball).
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
flat arm  10 × 5, holes at 0 and 40 mm
rod  Ø4
ball  Ø24, centre 80 mm from the pivot

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. 161: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_161.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/flyball-governor-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/governor-arm-80-ball-24/index.json
API: https://xemstudio.com/api/geometry?object=governor-arm-80-ball-24