Cutting metals from difficult-to-machine materials is challenging due to the damage caused to the cutting tool. The objective of this work is to evaluate the behavior of a BIDEMICS ceramic tool in dry turning of AISI 316L stainless steel and Ti6Al7Nb titanium alloy, both considered difficult to machine. The wear of the tool, its wear mechanisms, as well as the behavior of cutting force and surface roughness were studied and compared. The results showed that, in both cases, the wear of the cutting tool increased with the increase of cutting speed, resulting in material detachment. The main wear pattern is mainly related to adhesive and abrasive wear, in addition to detachment. For two of the speeds used to machine the Ti6Al7Nb alloy, the cutting force pattern shows the appearance of the chattering phenomenon that is reflected in the surface roughness behavior. This is not the case for the AISI 316L steel, which shows a stable behavior, also evidenced by the surface roughness pattern.