It is a simple box, with each side made out of a single piece of acrylic. The block in the middle had two threaded holes for the X and Y axes. The nuts on the inside of the table walls ensure that when the rod spins, the block moves instead of the rod. In the final construction, when the block would move, the table moves instead since the block is constrained. This transforms the rotational motion of the rod into the linear motion of the table. The same concept moves the Y axis, using the lower hole shown in the block. This block was machined out of aluminum. When gluing it up, some of the acrylic glue spread into the block, staining the table and making for a couple sticky spots. However, it still moves very well in the table.