The High Pressure Waterjet Assisted Machining (HPWAM) is a machining process that involves
high pressure coolant being delivered at the cutting zone. This paper investigates the performance of
conventional and HPWAM when machining Ti-6Al-4V titanium alloy. The evaluations were based on the tool
life, wear mechanisms, surface profile and chip formation. The coolant pressures, cutting speed, feed rate and
depth of cut were set at 11-20.3 MPa, 110m/min, 0.15 mm/rev and 0.5 mm respectively. The results showed that
improved tool life as much as 195% can be achieved when machining Ti-6Al-4V with HPWAM due to better
coolant access at the cutting zone. Surfaces generated when machining with HPWAM were generally
acceptable with negligible physical damage. Long and continuous chip formations were observed when
machining in conventional coolant supply corresponded to the low coolant pressure. Increasing coolant
pressure significantly reduces the chip size, resulting in a reduction in the tool-chip contact and improvement
in lubrication at the contact interfaces. This paper provides the understanding and correct use of HPWAM
especially when machining Ti-6Al-4V alloy
