Most woodworkers
know that a shear cut is far better than a straight cut. They
also know that a shearing cut produces a superior
finish and is much quieter during operation. The helical cutter
head addresses each of these through the use of spiral
staggered
knives that are shear cut. Each individual cutter head is
sharpened on four sides allowing for indexing. If you happen to
plane a
nail or staple, it is not necessary to replace knives the full
length of your planer head. Replace the 2 or 3 small knives
that
were affected and you are ready to get back to
work.