Yeah, Todd - It's not the pressure your compressor is running, but the volume it's capable of that's important. Air powered tools - sanders, ratchets, impact guns and cut-off wheels - all take a lot of air to run, but especially sanders, cut-off wheels and die-grinders because they tend to run almost continuously and eat lots of air.
I did all the cutting on my pan when I built it with an air cut-off wheel, but have since seldom used it and go, instead, for one of my electric sets, either two different size angle/cut-off tools or a Dremel (for small stuff). I just don't have enough air volume in my shop. But a multi-stage, high-volume compressor with maybe 160 gal capacity in 1 or 2 tanks would be awesome (IF.....I had the room!)
Brock, on that angle grinder/cutoff..... I have at least half a dozen scars from nicks around my knees when using one to built a whole-house wood-fired furnace years ago (when angle grinders first came out in the 80's). They work great, but if the damn thing didn't bite me it would set my jeans on fire from the discharge of the wheel. Sure saves a lot of time and makes accurate cuts, though!