[EricH]

Originally Posted by Jared341

Eric,

The problem is not with the vertical components of the vectors but rather with the horizontal. Also, I think that what I call "X" and what you call "X" are different.

So, using your notation:

Orientation of torque vectors - Vertical components - Horizontal Components

What I called "O":
/..\ (^v)(>>)
\../ (^v)(<<)

No problem here. The vertical components want the robot to turn CW, and so do the horizontal.

What I called "X":
\../ (^v) (<<)
/..\ (^v) (>>)

Problem! The vertical components want to turn CW, while the horizontal components want to turn CCW. The two cancel each other out as long as the roller friction is negligible.

I see now.

I also think that X and O should be "standardized" at a certain view for future reference. I'll let wiser heads than mine figure out whether you do it from the top or bottom, though.