Crank gear, module 1, 30 T with a Ø3 crank-pin hole at 10 mm — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/crank-gear-m1-30t-pin-r10/  (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 31.99, width 31.89, height 8.0
- The catalog module 1, 30-tooth gear (Ø10 bore, 8 face) with a Ø3 crank-pin hole on a 10 mm radius, a quarter tooth pitch (3°) off a tooth centre so that two of them meshed at 30 mm turn as mirror images (Cartwright's parallel motion).
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
module  1
teeth  30
crank radius  10 mm
pin hole  Ø3 at 3° from a tooth centre
bore  Ø10

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. 328: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_328.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/cartwright-parallel-motion-mechanism/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/crank-gear-m1-30t-pin-r10/index.json
API: https://xemstudio.com/api/geometry?object=crank-gear-m1-30t-pin-r10