The paper considers the problem of determining the forces and friction coefficient on the back surface of the cutting tool, the variable nature of which at each point of contact does not allow it to be used for modeling processes in the cutting zone. The paper offers an experimental express method that allows you to determine the cutting force and friction coefficient behind the cutting tools’ back surfaces. The equipment, the installation, and its main requirements are described to ensure the practical implementation of the proposed method of determining the forces and coefficient of friction. It is shown that the proposed method correlates well with other previously known methods. The dependences of the change of the coefficient of friction on the back surface of the cutting tool with coatings and without coatings were obtained. The effect of the lubricating and cooling liquid on the change in the coefficient of friction on the rear surface was investigated.