After many failed attempts at making a functional mechanism for a Useless Machine, I have decided to instead make a locking puzzle box. The idea is simple, there are multiple valves, each one connected to another valve or valves, or a pneumatic cylinder. There are 3 panels that open. The two smallest ones contain more valves. The goal is to open the large panel.
There are two switches accessible from the outside, with all the panels closed. One on the valves opens the lower right panel in one position and sends air down into the small panel's valves. One of the valves inside the small panel will close the small panel and connect to the one of the cylinders that open the large panel.
My goal is for the valves to be operated in a certain sequence to open the large panel.
Here is what I have right now:
The small panel is lifted by a small cylinder. I am thinking about switching from 3x11 panels to 5x11 panels on the sides to give me 2 more studs worth of height. This would allow me to stand the valves straight up and make them easier to mount and operate.