Having just completed my compressed air piping installation I have to come up with a pressure setting for it. I was thinking of using 90 psi, the minimum required for the highest pressure device (pneumatic drawbar for Bridgeport mill) to eliminate at least one pressure reducing valve. Most of the other stations scattered around the shop are for air nozzles and pneumatic operated tools. The drawbar is only occasionally used so cycling shouldn't be an issue, especially considering there is almost 200 gallons of tank capacitiy. What pressure setting do you use for shop air?