The experimental results show that the oil mist is the better cutting fluid compared with dry cutting and jet cold air, producing not only the smallest specific cutting force but also the smallest surface roughness and dimensional error. Therefore, oil mist is beneficial to micromilling of thin walls made of the Ti-6Al-4V titanium alloy by polycrystalline diamond end mills.

This investigation is a further study on the consideration of the cutting edge radius of the cutter and the material of the workpiece based on the methods of finite element simulation and the micro end cutting experiment. The minimum undeformed chip thickness (MUCT) value increases with the increase of the cutting edge radius, no matter which process. In this study, the influence of important variables on MUCT is studied as much as possible to reflect a real application situation.