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Whoa. Not entirely correct. You can do accurate positioning with
pneumatics, it's just harder to do than with hydraulics, because you have to
take air compressiblity and seal "stiction" into account if you want to hit
an arbitrary position that's in the middle of your cylinder's travel.
OK. That said, LEGO(R) pneumatic parts aren't ideal for accurate
positioning : (
> > what you ask is not possible because the Lego pneumatic system is,
> > precisely, *pneumatic*. In real life cylinders that are designed for
> > position control are hydraulic and not pneumatic ones. This difference is
> > very important because you can compress a gas but cannot compress a • liquid.
> > A pneumatic system has a very high degree of elasticity, and in practical
> > terms this means that position is a function of both the applied pressure
> > AND the encountered resistance.
>
> Ok. So you can't do it with pneumatics.
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