Two Stage Reduction Gear Prototype

Fri, 19 Dec 2014

If you've been following along on Instagram you'll have seen this gear mechanism as I've been working on it. Check it out in animated action here.


5.6:1 reduction gear box. Final prototype. #papertoy #papercraft #automata #gear #mechanism #paperengineering

A video posted by Rob Ives (@robivescom) on


This is a two stage reduction gear. Both stages use the same pair of gears. A nine tooth gear meshing with a nineteen tooth gear giving a reduction of 19 : 8 or 2.375 : 1

The two gear sets are chained together. To work out the final output speed you simply multiply the two ratios together. 2.375 x 2.375 = 5.640625 So the output crank turns at just about 5.6th the speed of the input handle. (Not 5.3 as I incorrectly wrote on my Instagram comment. Grrr!)

You can see the input gear more clearly on this picture.

And here is the finished thing.

I'm away for a few days now but as soon as I'm back I'll be adding this as a project. I'm really pleased with how these mesh gear mechanisms are working out, I feel like I finally really have a grip on paper gears!

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Comments (1)

  • Smelter December 20, 2014 at 11:28 am

    Ho ho ho,
    Looks like things

    Ho ho ho,

    Looks like things are moving in the right direction.

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