Let's Make Robots!


Walks down slopes using gravity, makes his owner smile.
Wobbly is a 3D-printed, gravity-powered, walking automaton. He basically walks down slopes. Read more

Antique desk, marvel of engineering


I can't even imagine the time it took to design & build something like this. All done with no electricity, motors, or micros.

How to pull on a fishing line

I'm making some simple motorized (but small) clothing accessories, and part of it is actuated by pulling on a length of fishing line. I'm trying to figure out the best way to do that. I was thinking a little spool, but there are some problems. The fishing line could go slack if the part is pushed on, and I need the line to not unspool. Second is that it needs to be really small... the closer to about a half centimeter (from flange to flange), or less, the better. I'm having a hard time finding something that small. Is there some better way than a spool?

Any good mechanical engineering books?

I just finished reading this: http://www.allaboutcircuits.com/. It really helped me understand all the electronic background of robotics. Now I feel like reading about mechanical engineering so does anyone have a good book or website to recommend? 

Sprockets and Gears

Where are some good online stores to buy sprockets, gears, etc. from? In small and large sizes.


Incredible wooden mechanical machines video

Have a look at the engineering that has gone into some of these machines. I especially like the gearbox mechanism on the 2nd video to change from raising to extending the arm.