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Pneumatic actuators for 2DOF and more
a nice one!
not really suitable for home use: is noisy (air exhaust, compressor), air exhausted is oily
difficult to control as affordable valves are on/off only
you can use linear position sensor and proportional servo valve then it's possible to set position and vary speed. But it's costly.
interrupted project by @berty
PS : many gSeat have been designed with bladder compression. It's a kind of "soft" pneumatic actuator.
Circuit is closed so no exhaust noise, no compressor.