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Single-tooth pinion driving a 40-tooth wheel (one tooth per turn)

How does a one-tooth wheel index a gear? · Hardware · basis: Xem Studio design following Brown No. 241 (1868)

Also called: single tooth gear, intermittent gear, one tooth per revolution, counter gear, engranaje intermitente de un diente, Einzahn-Schrittgetriebe

Exact dimensions. True size, with no printing tolerance added.

sizes
4 in table

Notes

  • 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.

Single-tooth pinion driving a 40-tooth wheel size chart

parametervalue
pinion1 tooth (of 20), module 1
wheel40 T
index9° per turn
centre distance30 mm

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Henry T. Brown (1868, public domain)Five Hundred and Seven Mechanical Movements — scan on archive.orgwebPublisher's page; dimensions are facts
507movements.comBrown's movement No. 241: figure, his text and an animationwebPublisher's page; dimensions are facts

Free files

★ Free files 1 parts. Xem Studio design: free to use, print and sell things from; not to be republished as files. Xem Studio Design License. index.json

single-tooth-intermittent-gear-mechanism-assemblyAssembled mechanism, all parts placed at one pose (STEP keeps each part separate)STEP · STL
Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
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Plain text: sheet.txt · JSON: /api/geometry?object=single-tooth-intermittent-gear-mechanism

Single-tooth pinion driving a 40-tooth wheel (one tooth per turn), isometric render of a generated part
Render of single-tooth-intermittent-gear-mechanism-assembly from the free STEP; not to scale.

Fits with

Single-tooth pinion: module 1, 20-tooth gear with one tooth left, isometric render of a generated part
Single-tooth pinion: module 1, 20-tooth gear with one tooth left19.74×17.5×8.0 mm★ 1 file
Spur gears, module 1: 10 to 80 teeth (20° involute), isometric render of a generated part
Spur gears, module 1: 10 to 80 teeth (20° involute)26 sizes★ 26 files
Dowel pins, 2–6 mm (ISO 2338 / DIN 6325), isometric render of a generated part
Dowel pins, 2–6 mm (ISO 2338 / DIN 6325)5 sizes★ 23 files
Linear shafts Ø3 to Ø25 mm (h6), 100 to 1000 mm long, isometric render of a generated part
Linear shafts Ø3 to Ø25 mm (h6), 100 to 1000 mm long10 sizes★ 70 files

Questions

How does a one-tooth wheel index a gear?

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.