Grooved friction wheel, pitch Ø30, 4 mm V-grooves × 16 wide — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/grooved-friction-wheel-30/  (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 33.0, width 33.0, height 16.0
- Friction wheel with circumferential V-ridges and grooves (±1.5 mm about a Ø30 pitch line, 4 mm pitch, 67.38° included), 16 mm wide, Ø5 bore (ridges at z = 0, 4, 8, 12, 16): wedged into its mate, the grooves raise the grip of a plain friction wheel about 1/sin(half-angle) times.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
pitch Ø  30 mm
groove pitch  4 mm
depth  ±1.5 mm
included angle  67.38°
width  16 mm
bore  Ø5

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. 45: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_045.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/grooved-friction-wheels-mechanism/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/grooved-friction-wheel-30/index.json
API: https://xemstudio.com/api/geometry?object=grooved-friction-wheel-30