Adding weights to gear bits using only parts from the box


I found an alternative to washers for making gear bits run reliably - use a cog or a ball to add weight to the top!

This also makes a single gear bit behave reliably like a simple blue bit.

Using two weighted gear bits one can also capture balls and trigger their release using another ball.

I have made a short video to demonstrate:

One thing I forgot to show is that if you attach the weight on the side instead of the top then it always returns to that side - it behaves like a green ramp.

In theory one could make a version of turning Tumble where the whole board is non-removable gear bits, plus adjustable weights and cogs.

Missing washers
Where can I obtain more marbles?
Part Idea: Stored/Releasable Ball
Issues with reliability in certain configurations

Brilliant! Clever use of existing parts.


Yes, I agree that this is very clever! I especially like the option to capture & release. For you EE’s out there, what is the real-world analogous circuit component? Is it a capacitor? If not, how does it differ from a capacitor?


That’s really, really clever. It never occurred to me to just add weight. I got so stuck thinking about friction that I never even considered changing the weight. I’m not a fan of those washers, either. They were sort of a hack that I introduced pretty late in the game because the injection molded parts had so much less friction than my CNC milled prototype parts.

And wow, the setup you made that captures and releases a ball? It’s brilliant!