in table 6 cut material round bar composed of jis scm440 in which four longitudinal grooves are formed at equal intervals in the direction of length similar to the dry high speed intermittent cutting test using alloy steel the amount of wear of the flank of the cutting edge or the service life of the cutting edge was measured the cut material and test conditions used are indicated below the results are shown in table 6 cut material round bar composed of jis s45c in which four longitudinal grooves are formed at equal intervals in the direction of length similar to these tests the amount of wear of the flank of the cutting edge or the service life of the cutting edge was measured the cut material and test conditions used are indicated below the results are shown in table 6 cut material round bar composed of jis fc300 in which four longitudinal grooves are formed at equal intervals in the direction of length moreover the coated cermet cutting tools of examples 8 13 and 18 20 and the coated cermet cutting tools of comparative examples 8 13 and 18 20 were bolted to the end of the tool steel cutting bit followed by performing the cutting.