Form tools constructed with “logarithmic relief grinding” are commonly referred to as “constant profile” tools. The logarithmic fall-off on the back of the cutting edge, in fact, guarantees the constancy of the rake and profile even after the tooth’s face has been reground.
Despite the fact that the initial value of a cutter of this kind is usually higher than one with a rectilinear rake, economical advantage is ensured by the fact that the tool regains the same productive capacity as original after each regrinding.
When well-designed and correctly constructed, a cutter of this type is guaranteed to permit an elevated number of regrindings.
Combination with spiral toothing is possible.