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1 ‒ Caspian Public University, Almaty, the Republic of Ka­ zakhstan, e­mail: biletskymarc@yandex.ru; ratov69@mail.ru 2 ‒ Dnipro University of Technology, Dnipro, Ukraine, e­mail: aak2@ua.fm; inteldriller@gmail.com M. t. Biletsky1, Cand. Sc. (tech.), Assoc. Prof., orcid.org/0000-0002-4947-5686, A. A. kozhevnykov2, dr. Sc. (tech.), Prof., orcid.org/0000-0002-6876-4168, B. t. ratov1, dr. Sc. (tech.), Prof., orcid.org/0000-0003-4707-3322, V. l. khomenko2, Cand. Sc. (tech.), Assoc. Prof., orcid.org/0000-0002-3607-5106

Dependence of the drilling speed on the frictional forces on the cutters of the rock-cutting tool