Japanese Lego builder akiyuky has been featured on the MAKE blog numerous times, including his great ball contraption (and another) as well as his monster 5-axis robotic arm. This time he’s built a large robot the sole purpose of which is to sort his Lego cross axles by length.
Från http://blog.makezine.com/2013/01/10/mindstorms-axle-sorter/