Geneva drive: 4 and 6 station wheels, R30, with drive discs — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/geneva-drive/  (CC BY 4.0)
Basis: Geneva geometry: centre distance c = R / cos(π/n), drive pin radius R·tan(π/n); Ø5 pin, Ø5 shafts
Catalog version: 2026-10-20

Sizes: see table below
- Turns continuous rotation into steps: the wheel indexes 360/n degrees once per turn of the drive, then is held by the drive's locking disc until the next index.
- Wheels are R30 × 6 with 5 mm slots for the Ø5 drive pin. The drive is a 3 mm base plate carrying the locking disc and the pin; the wheel runs in the plane of the disc and pin, 3 mm above the base.
- The locking arcs on the wheel are 0.3 mm larger than the locking disc: a designed gap, keep it.
- Checked over a full turn of the drive for both wheels: pin, disc and wheel never overlap.

stations  index angle  centre distance  drive pin radius  locking disc radius
4  90°  42.4 mm  30.0 mm  26.0 mm
6  60°  34.6 mm  17.3 mm  13.3 mm

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Geneva drive — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Geneva_drive
- Long Earth Society: Engine and rig builds on extrusion frames — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 4 parts): https://xemstudio.com/files/hardware/geneva-drive/index.json
API: https://xemstudio.com/api/geometry?object=geneva-drive