"Buerste" wrote in message
...
I'm working on a design for a machine that will make a number of different
yet similar products. There will be 2 servos and a stepper to do the bull
work yet there is one air cylinder that will provide pressure on material.
The amount of pressure will vary from one product to another and from one
kind of material to another. I'd like to automatically change the air
pressure within the program for each product/material. Such a thing? No,
I'm not going to build one. If it ain't off the shelf, it won't happen.

There are electrically controlled regulators, they can take an analog output
from a PLC or similar and control air pressure. We have them at work on our
tire uniformity optimizers and balancers, I'll see if I can get some info on
them. We have different inflate pressures depending on the tire being
tested and the machines automatically adjusts. Of course there are also
proportional valves and pressure transducers but you have to close the loop
in the controller.

RogerN