pic: Four-Speed Ball-Lock Single-Pneumatic Transmission Design

[camtunkpa]

Our shifts were not reliable because of the coasting you mentioned. We actually didn't even get to the stage of running the cylinders in the transmission because of the coast It is very difficult to get exactly the same amount of pressure at both ports of the cylinder. We didn't spend alot of time once we couldn't really get rid of the drift.

Servos would definitely work, but they would be slow to shift. Our transmissions take very little pressure to shift. They will also stay engaged for quite a while without any pressure at all.

You could still use a lead screw setup, but use a linkage to connect it to a spring loaded plunger shaft.

I'm sure there are many other ways to shift this, but I'm drawing a blank right now. It's too bad multi-position cylinders aren't FIRST legal.