There are 520 individual carbide cutting knives on this 53″ planer/sander. One of our hardworking mill employees is doing the first cutter right now and he only has 519 more to go. Yes this process takes a long time but we don’t mind investing the time and money into good equipment to produce the best lumber products. Even though this will take a long time to replace all 520 cutters they are carbide so they typically last longer than a standard high speed steel straight knife planer blade. This is important when working with extremely dense hardwoods like we sell. Not only do our cutters last longer because they are carbide but we find there is less planer snipe with these cutters and our customers appreciate that. We have several of these in our company wide arsenal of 10 different planers including straight knife conventional, Rotary planers, and wide belt planer/Sanders.