I've got the usually handful of garbage burrs when picks up before you realize that this could be a serious tool with the right drive. I have a couple low end pneumatic die grinders as well. I never care for any of those type of air tools. They use to much air and even largish home shop compressor can't keep up for more than a few minutes.
Well recently I picked up an electric die grinder. No not a dremel or dremel clone. (I actually dislike Dremel rotary drive tools although they make some useful accessories.) A serious chunk of motor with a 1/4 inch drive. Something with some umph!
I'd like to pick up some better carbide burrs. Maybe get away from those things that look more like rotary rasps even. LOL. I was wondering what burr you keep in your die grinder? Which one is most likely to still be in the tool when you pick it up? Well if you weren't the guy who always takes the burr out and puts it back in the case. What is the most useful burr you own?
What do you use a die grinder for most often with that burr?
My intent is back grinding aluminum welds (as Polack suggests in his book on boat building) in marine applications before back welding a seam. To be fair I may not do it much though.