My experience is that pneumatic cylinder actuators are inexpensive to implement while electric actuators are expensive to implement. So, what do you mean by “total cost of ownership”? My experience is that all pneumatic systems incur leaks of some kind. How much is that a factor and can’t I just fix them? This brings us back to maintenance and replacement. Since electrical systems have an initially higher cost of replacement, does maintenance of a pneumatic system balance out the costs?
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