Router type cutter

A router type cutter having a longitudinal axis of rotation, a drive spigot located at one end of said cutter for clamping within a rotatable toolholder of a machine tool, a plurality of helices extending part-way along said cutter from the other end and a corresponding plurality of flutes, and a helically twisted and sintered tungsten carbide insert providing a cutting edge brazed onto each said helix and having a non-undulating, leading radial rake face, from a radially outermost edge of which insert extends a radially outermost face being generally tangential with respect to said longitudinal axis and also being generally longitudinal of said cutter, with a non-linear cutting profile, produced after brazing said insert into position by forming alternating recesses and projections by means of a diamond form grinding wheel having a grinding circumference of approximate profile, with said wheel being advanced into said carbide;

• and said alternating recesses and projections provided along said radially outermost face to provide said cutting edge wherein in the direction of rotation of said cutter, said alternating recesses and projections of one insert are staggered with respect to said alternating recesses and projections of another said insert.