Editing Openai/68fceef0-7248-8013-bf5d-581461dec5bc (section)

=== User: For our purposes, we will use a single pinion with a drum in the center. ===
For our purposes, we will use a single pinion with a drum in the center. It's a long pinion that goes down both arms or up both arms. This is simplicity. We are omitting the whole extra feature setup that I normally have, which has three of these pinions. This is for mathematical simplicity. Rack length is a variable. Minimum 12 inches. Maximum 48 inches. This is regardless of the pitch of this stuff. The pinions have drums. Actually, there are two drums. One is an intake and one is an output. Their locations are as follows. For the top unit, the pinion going down the rack here is located on the top of the rack. We will assume that it is secured to the rack with a neutral system that does not change the friction or other factors. You do not need to calculate that or the chances of it bouncing off. The bottom pinion for the bottom unit is on the bottom of the rack. It is also stipulated that for whatever method we don't care, it is also secure and will not bounce off of the rack. It will follow the rack. There is a tension system. It doesn't matter. We're not worried. We're not including that in our calculations. Please summarize these instructions so far.