Very little. Not so you would notice it while cutting. If you put a square to it, it is not square but the blade runs very close to true up and down. I cut a lot of jigsaw puzzles and if it had a lot of back and forth movement, my pieces would not slide together from either side easily. I also cut a lot of 2" walnut for box sides and have no problem. Ray at Seyco can answer all your questions.