After you are done with the cutting part, we will need to attach the gears to the shaft and the x-roller. The wooden structure on which the whole system rests is a tripod with a hole in it's center for the bearing and the shaft. On top of the tripod rests a disc that we rotate as a steering. This disc is attached to a shaft. On the underside this shaft is attached to a gear which drives another gear that is on the x-roller.
We fit the gears on the shaft and the x-roller. The mechanical intricacies of the gears are left for you to chose. It wont make such a difference.