One tooth turning a notched wheel one notch per turn, locked between (Geneva principle) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/single-tooth-intermittent-wheel-mechanism/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown No. 68 (1868)
Catalog version: 2026-10-20

Sizes: see table below
- A driver with a single tooth (here a round pin) turns a wheel with notches: once per turn the tooth enters a notch and moves the wheel one division; for the rest of the turn the driver's plain rim sits in a concave arc of the wheel and locks it.
- Drawn with the catalog 6-station Geneva pair (R30 wheel, pin at R17.32, centres 34.64 mm = R / cos 30°): the pin is at the bottom of a slot at mid-index. The wheel moves 60° in 120° of driver rotation and stands locked for 240°.
- Brown's No. 68 (one tooth driving a notched wheel one notch per revolution, the blank part of the driver's rim locking it). Brown's Geneva stop (No. 212) is the watch-winding form.
- Parts (each has its own page): geneva-drive, dowel-pins-metric.
- Brown's movement No. 68 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

parameter  value
stations  6
wheel  R30, 5 mm slots
pin radius  17.32 mm
centres  34.64 mm
motion / dwell  120° / 240° of driver turn

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. 68: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_068.html

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/single-tooth-intermittent-wheel-mechanism/index.json
API: https://xemstudio.com/api/geometry?object=single-tooth-intermittent-wheel-mechanism