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Friction wheels (rolling contact drive), 30 : 60

How much torque can friction wheels transmit? · Hardware · basis: Xem Studio design following Brown No. 32 (1868)

Also called: friction drive, friction wheels, rolling contact drive, ruedas de fricción, Reibradgetriebe

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

sizes
3 in table

Notes

  • Two plain wheels pressed together drive each other by friction at the line of contact: ratio = D₂/D₁ (2 : 1 here), opposite directions, and they slip instead of breaking when overloaded.
  • Torque at the small wheel ≈ μ·F·R₁: with rubber on steel (μ ≈ 0.6) and 50 N pressing, about 0.45 N·m. Centre distance = (D₁ + D₂)/2 = 45 mm, rims touching.
  • Brown's No. 32 (friction wheels with roughened or leather/rubber-covered rims).
  • Parts (each has its own page): friction-wheel-30x10, friction-wheel-60x10.
  • Brown's movement No. 32 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

Friction wheels (rolling contact drive), 30 : 60 size chart

parametervalue
wheelsØ30 and Ø60 × 10
centre distance45 mm
ratio2 : 1

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. 32: 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

friction-wheels-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=friction-wheels-mechanism

Friction wheels (rolling contact drive), 30 : 60, isometric render of a generated part
Render of friction-wheels-mechanism-assembly from the free STEP; not to scale.

Fits with

Friction wheel Ø30 × 10, Ø5 bore, isometric render of a generated part
Friction wheel Ø30 × 10, Ø5 bore30.0×30.0×10.0 mm★ 1 file
Friction wheel Ø60 × 10, Ø8 bore, isometric render of a generated part
Friction wheel Ø60 × 10, Ø8 bore60.0×60.0×10.0 mm★ 1 file

Questions

How much torque can friction wheels transmit?

Two plain wheels pressed together drive each other by friction at the line of contact: ratio = D₂/D₁ (2 : 1 here), opposite directions, and they slip instead of breaking when overloaded.