[Rob Colatutto]

You are correct. My high school team did this in 2001 and 2003 for our arms. The system lets you stop the piston where ever you want. We never had any sensors on it but you could easily do it with some on there. The way we had it set up was, run from the regulator into a double solenoid, then the air would flow dirrectly to the extension connector (front) on the piston, but then the retraction (back) air flow would be routed through a single solenoid to with its relief valves looped together. This allowed us to stop the pneumatic at any position with some fancy programming, but you would have to ask an old 263 programmer how to do that. One thing to watch out for is the lever arm's weight on that pneumatic. We had a slight drifting problem with the arm when we had 10 pounds on the end of it 4.5 feet from the pneumatic. With the right calculations this can be solved though.