Xem Studiomeasured geometry

Library › Mechanisms › Gears ·

Stepped (staggered) spur gearing, 20 : 40, two steps

What is stepped gearing? · Hardware · basis: Xem Studio design following Brown No. 44 (1868)

Also called: stepped gear, staggered gear, step gearing, hooke gear, engranaje escalonado, Stufenzahnrad

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

sizes
5 in table

Notes

  • Each wheel is two identical spur gears side by side, the second turned by half a tooth pitch: the steps share the load so that one pair is always near the pitch point, giving smoother, stronger drive — the step towards helical gears.
  • Built here from four catalog module 1 gears (20 and 40 teeth), the upper layer turned 9° (pinion) and 4.5° (wheel); centre distance 30 mm, no backlash drawn.
  • Brown's No. 44 notes its use for heavy, slow drives such as large planing-machine beds.
  • Parts (each has its own page): spur-gears-module-1.
  • Brown's movement No. 44 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

Stepped (staggered) spur gearing, 20 : 40, two steps size chart

parametervalue
module1
teeth20 / 40, two layers each
layer offsethalf a pitch (9° / 4.5°)
centre distance30 mm
face2 × 8 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. 44: figure, his text and an animationwebPublisher's page; dimensions are facts

Free files

★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

stepped-gearing-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.
Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=stepped-gearing-mechanism

Stepped (staggered) spur gearing, 20 : 40, two steps, isometric render of a generated part
Render of stepped-gearing-mechanism-assembly from the free STEP; not to scale.

Fits with

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

Questions

What is stepped gearing?

Each wheel is two identical spur gears side by side, the second turned by half a tooth pitch: the steps share the load so that one pair is always near the pitch point, giving smoother, stronger drive — the step towards helical gears.