Single-tooth pinion driving a 40-tooth wheel (one tooth per turn) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/single-tooth-intermittent-gear-mechanism/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown No. 241 (1868)
Catalog version: 2026-10-20

Sizes: see table below
- A pinion stripped to one tooth turns continuously; once a revolution its tooth enters a space of the 40-tooth wheel and moves it on by one tooth (9°), then the wheel rests for the remaining turn. 40 turns of the pinion give one of the wheel: a counter or a slow intermittent feed.
- Drawn in mesh at the pitch point (centre distance 30 mm, module 1). Between advances the wheel must be held by a detent or a friction spring, as in Brown's figure; that is not drawn.
- Brown's No. 241 (intermittent circular motion from continuous, wheel A moved one tooth per revolution of the single-toothed wheel).
- Parts (each has its own page): single-tooth-pinion-m1-20t, spur-gears-module-1, dowel-pins-metric, linear-shafts-h6.
- Brown's movement No. 241 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

parameter  value
pinion  1 tooth (of 20), module 1
wheel  40 T
index  9° per turn
centre distance  30 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. 241: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_241.html

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