Abstract
The purpose of this study is to find out effective parameters for monitoring of cutting process to achieve highly efficient end-milling process of titanium alloy, which is difficult-to-cut material. Cutting tests were carried out in down-cut milling to observe state of chips on cutting edge and to measure width of tool wear land and dynamic cutting forces with increase in cutting speed and cutting length. As a result, it was revealed that width of flank wear land and its rate of increase could be related with length of deposited chips on cutting edge and extremes of dynamic cutting forces.