ExpanDrive

Also, a testimonial of the Kiva system in action at Zappos. The pod lifting mechanism is a screw jack. When lifting or lowering a pod, the robot spins on the floor at same speed as the screw, but in the opposite direction, to keep the pod from rotating. I can’t tell for sure, but I think that the robots are guided primarily by barcode stickers on the floor, and that the lines and circles are just tire marks.