Why hasn't it been uploaded? I pressed the upload button..

anyway

I bought an RV gear that would fit the bottom of the robot at a local bearing store.

at around 890$ (50%~ off) (because i m student)

Normaly the color of the outer case is not black, but this is. because it's not a standard product. 

As you can see from the drawing, the shape of the Center gear is different.

Of course, i will planning to produce and upload hardware for the basic model later.

So.. i have to do make another center gear fitted in this gear.

this gears reduction ratio is 1:49.82(normaly. you can manage this ratio using custom gearbox)