29/03/2005 · My dad made a stump grinder out of a tiller some years ago. For the actual cutter, he ganged a halfdozen or so used circular saw blades. It worked pretty well. I don't know if you are doing a whole lot of stumps, or if you just have a few to remove. I have never used a a "real" stump grinder, so I cannot say how it measured up. Good luck.