Abstract: Various embodiments of loader assemblies are disclosed for controlling the translational and rotational movement of a workpiece. One or more pairs of offset compound wheels are configured to support and control a workpiece. In one configuration, a left-handed mecanum wheel is paired with an offset right-handed mecanum wheel. By rotating offset compound wheels independently of each other, the workpiece can be made to move forward or backward, and at the same time have an independently controlled clockwise or counterclockwise rotational motion.