I am considering adding an air compressor to my “shop”. Love the air powered tools that come with many advantages over the electric ones. I was thinking to use it for spraying, drilling and sanding. As expected, size and costs are important. No problem with the spraying equipment. However when I checked about sanding - I was more than surprised. Random orbital sanders require 17 cfpm while all other tools require far less. Even grinders. First, is that correct and why? What compressor can deliver such air pressure?