Cutter blade arrangement

In a cutting blade for cutting logs to timber form, wherein the cutting blade includes an outer periphery having a first recess formed therein, a knife means mounted in the first recess in the periphery of the cutting blade, a second recess in the periphery of the cutting blade adjacent the first recess formed therein which functions to accommodate chips removed by the knife means, the improvement comprising, said knife means including a knife and a cassette, each cassette having inner and outer parts for clamping said knife therebetween, said knife including spaced cutting edges, said knife being indexable within said cassette, said knife means being secured to the cutting blade by a screw-threaded bolt means which passes through the knife means, a separate wear insert mounted with the second recess, said wear insert being removably connected to the cutting blade, each of said knife means and said wear insert having outer surfaces, said wear insert being secured to the cutting blade by second bolt means which extends through said wear insert, and each of said knife means and said wear insert having outer surfaces with a countersunk opening for said bolt means so as to provide smooth outer surfaces on said knife means and said wear insert whereby said bolt means and said second bolt means are substantially flush with said outer surfaces of said knife means and said wear insert, respectively.