Abstract
This paper describes the results of experiments on high speed milling of quenched die steel using small diameter cBN ball endmills. For the experiment, three kinds of cBN ball endmills with the different cutting edge shape that it was tool radius 0.3mm, and the developed small high-speed milling machine were used. In the cutting condition of rotational speed N=170,OOOmin-1, depth of cut Ad=0.O1mm/Pf=0. 05mm, feed speed F=1000mm/min, the long tool-life machining was possible.
