DA sander is dual action. Spins and orbits at the same time.Aussie John said:Hey CTPhil, what type of sander is a DA sander? Probably a different name for the types we have here. I also have a sand blasting cabinet using ground glass for small items, bolts etc and a nozzle which plugs into my air compressor hose and draws the grit from a drum. This only gets used for hard to get at areas though as it is messy to use.