Slotted arm with a 60° toothed sector (module 1, 60 T), Ø5 bore — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/slotted-arm-sector-gear-m1-60t-60deg-b5/  (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 28.85, width 138.98, height 8.0
- 8 mm plate: a 60° sector of a module 1, 60-tooth gear (pitch R30) on one side of a Ø14 hub (Ø5 bore) and a 16 mm wide arm 100 mm long on the other with a 6.4 mm slot from 40 to 100 mm out for a crank-pin slide block. Teeth are placed so a tooth space is centred on the arm's axis (−Y).
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
sector  60° of 60 T, module 1 (pitch R30)
arm  100 mm, 6.4 slot 40–100
hub  Ø14, Ø5 bore
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. 131: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_131.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/crank-slotted-arm-sector-rack-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/slotted-arm-sector-gear-m1-60t-60deg-b5/index.json
API: https://xemstudio.com/api/geometry?object=slotted-arm-sector-gear-m1-60t-60deg-b5