The influence of lubricating and cooling process media of plant and animal nature on reducing the components of the cutting force and the area of contact of the tool with chips, in the process of turning titanium alloy and stainless steel has been experimentally established. It has been shown that the use of vegetable and animal fats in the initial period of cutting in combination with environmentally oriented minimum lubrication technology (MQL) favorably affect the increase in the contact pressure of the tool with chips, which in turn contributes to an increase in the density of dislocations and therefore hardening the contact layers of the tool