I’m really having fun with these paper gears. For ages, I struggled to design an easy to make, reliable paper gear mechanism. I think I’ve finally hit on some workable ideas: Today’s experiment, a co-axial gearbox.

I’ve finished a working design which I’ll be posting in the next day to two. The basic concept, turn the handle on the front and the output drive on the back of the box, turns at half the speed of the handle. You can see an Instagram of the model in action here.

Here are the parts, cut out and ready for assembly photography tomorrow.