Today, cutting fluid is usually no longer necessary to have a coating is an important reason. They are to mitigate the impact of temperature by suppressing the blade from the cutting zone (tool) heat transfer. Role as a layer of thermal barrier coatings, because it has thermal conductivity than the material of the tool and the workpiece substrate much lower.

Therefore, these absorb less heat tool, can withstand high cutting temperatures. Whether turning or milling, coated tools allow a more efficient cutting parameters without compromising tool life.

The coating thickness between 2 to 18m, it plays an important role in the performance of the tool. Thinner coatings than thick coatings during impact cutting, is subjected to temperature changes better performance, because the thinner the coating stress is small, easy to crack. When rapid cooling and heating, thick glass coating as extremely fast heating and cooling as easily break anymore. Dry-cutting blade with a thin coating can increase tool life by up to 40%, which is the physical coating used to coat the circular cutter and milling insert reasons. pvd coating often than chemical coating applied to thin, and the combination was more solid outline. In addition, pvd coating may be at a much lower temperature deposited on carbide, so they more used very sharp edge and a large positive rake angle milling, turning.