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Single-tooth pinion: module 1, 20-tooth gear with one tooth left

What is a single-tooth gear? · Modern device · basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance

Also called: single tooth gear, one tooth pinion, intermittent pinion, piñón de un diente, Einzahnrad

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

length
19.74 mm
width
17.5 mm
height
8.0 mm

Notes

  • The catalog module 1, 20-tooth gear (Ø6 bore, 8 face) cut down to its root circle (Ø17.5) everywhere except one involute tooth (±9.5° about +X): every turn it engages the driven wheel and advances it exactly one tooth.
  • Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

Single-tooth pinion: module 1, 20-tooth gear with one tooth left size chart

dimensionvalue
module1
teeth1 of 20
root Ø17.5 mm
boreØ6
face8 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
Xem StudiodrawingwebPublisher'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-pinion-m1-20tpinion, tooth on +X, z 0..8STEP · 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.
Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=single-tooth-pinion-m1-20t

Single-tooth pinion: module 1, 20-tooth gear with one tooth left, isometric render of a generated part
Render of single-tooth-pinion-m1-20t from the free STEP; not to scale.

Fits with

Single-tooth pinion driving a 40-tooth wheel (one tooth per turn), isometric render of a generated part
Single-tooth pinion driving a 40-tooth wheel (one tooth per turn)4 sizes★ 1 file

Questions

What is a single-tooth gear?

The catalog module 1, 20-tooth gear (Ø6 bore, 8 face) cut down to its root circle (Ø17.5) everywhere except one involute tooth (±9.5° about +X): every turn it engages the driven wheel and advances it exactly one tooth.