If the blade rocks at all, this may end result in a curved edge on the planer blade. The one thousand/3000 stones are what make the micro-edge, and the 8000 stone (pulled alongside) gives that edge a polish, which is what tends to make the big difference among a "meh" sharp blade and a "woah" sharp a single. Chilly Planers - (15 organizations) Chilly planers are pavement recycling machines.