Quote:
Originally Posted by Dad1279
Did you actually try this? I can think of a few immediate issues, like valves need a minimum pressure to operate, and a servo has 170 degrees of throw, where a regulator has multiple turns.
I haven't tried it, but I also think servo will not have enough power to turn a KOP regulator.
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1) there are no valves that require actuation so that issue is avoided entirely. The only valve is a single solenoid that is open by default and never needs to be switched.
2) Not all servos have such limits. Sail winch servos can travel 3 full rotations, I believe, and some servos can rotate indefinitely, but have no position feedback (see point 3)
3)It doesn't have to be a servo, a motor (or continuous rotation servo) with a potentiometer or encoder would also work with some extra programming. Gearing could also increase available torque for weaker motors/ servos.
No, I have not tried it physically, but the physics works out, at any given pressure, a certain pneumatic cylinder has a set force. Additionally, at any given displacement, a certain spring has a calculable restoring force, if these forces, along with forces applied by the weight of the mechanism (assuming an unbalanced mechanism) balance out to zero, the mechanism will be stationary (technically, it might exhibit oscillations, but by reducing the flow rate out the open port on the cylinder, they should be dampened to the point at which the amplitude is nominal).
However, I do have 2 corrections to make and they shall be made momentarily.