The article considers the features of the drilling process where there is a change in temperature, hole diameter, and displacement relative to the axis and the impact on the tool, when machining holes with high-speed steel drills there is wear of the transverse edge which is completely rounded to create a conical surface. There is a decrease in the negative value of the front corners on the transverse edge of the decrease in axial force, which led to a decrease in the intensity of wear of the transverse edge. In order of increasing axial force, respectively, and the intensity of wear of the transverse edge, were sharpened and recommended sharpening methods that provide high performance of the drill, the greatest stability, increased drilling accuracy, as well as the lowest cutting force. The analysis of influence of technological methods and ways and equipment on accuracy and quality of deep openings of small diameter is carried out. The effects of the method of lubricating coolant supply on the tool stability and processing productivity are investigated. The analysis of processing on the metal-cutting equipment with constructive development of the device is executed. Also, the stress-strain state of the drilling process by the finite element method with the analysis of external influences on the twist drill is carried out. The results of the research substantiate and recommend technological methods that reduce the deformation of the tool and, as a consequence, increase the quality and accuracy of the dimensions of deep holes of small diameter.
 A. K. Sinelytsikov, G. V. Filippov, “Povysheniye effektivnosti obrabotki spiral'nymi sverlami” [“Improving the efficiency of processing spiral drills”], Stanki i instrument [Machines and tools], no. 3, pp. 35–37, 1974. [in Russian].
 V. P. Marshuba, O. V. Chernyakova, “Osnovni napryamky pidvyshchennya tochnosti ta produktyvnosti hlybokoho sverdlinnya spiralʹnymy sverdlamy” [“The main directions of increasing the accuracy and productivity of deep drilling with twist drills”], Mashinobuduvannya [Mechanical Engineering], no. 6, pp. 72‒84, 2010. [in Ukrainian].
 A. A. Avakov, Fizicheskiye osnovy teorii stoykosti rezhushchikh instrumentov [Physical foundations of the theory of durability of cutting tools]. Moscow, Russia: Mashgiz Publ., 1960. [in Russian].
 V. A. Grechishnikov et al., Rezhushchiye instrumenty [Cutting tools]. Staryy Oskol, Russia: TNT Publ., 2012. [in Russian].
 G. I. Granovskiy, V. G. Granovskiy, Rezaniye metallov [Metal cutting]. Moscow, Russia: Vysshaya shkola Publ., 1960. [in Russian].
 P. A. Yudkovsky, I. K. Kryuchkov, A. P. Shevel, Povysheniye kachestva spiral'nykh sverl [Improving the quality of twist drills]. Chelyabinsk, Russia: Yuzhno-Ural'skoye knizhnoye izdatel'stvo, 1970. [in Russian].
 V. P. Marshuba, A. O. Digtyar, “Fizychne modelyuvannya protsesu paketuvannya struzhky pry hlybokomu sverdlinni” [“Physical modeling of the chip packing process during deep drilling”], Mashinobuduvannya [Mechanical Engineering], no. 3, pp. 96–100, 2008. [in Ukrainian].
 R. T. Karpyk, N. O. Kostiuk, “Doslidzhennya tekhnolohichnykh parametriv protsesu obrobky otvoriv maloho diametra pid chas hlybokoho sverdlinnya” [“Research of technological parameters of the process of processing of creations of a small diagnostic in the deep surface”], Visnyk Natsionalnoho universytetu “Lvivska politekhnika” [Scientific Herald of Lviv Polytechnic National University], no. 913, pp. 23–30, 2019. [in Ukrainian].
 G. P. Shpenkov, Fizikokhimiya treniya [Physicochemistry of friction]. Minsk, Belarus: University Publ., 1991. [in Russian].
 K. I. Tsidilo, R. T. Karpyk, V. S. Vitvitsky, A. A. Saparov, “Modelyuvannya napruzheno-deformovanoho stanu osʹovoho rizalʹnoho instrumentu metodom skinchennykh elementiv” [“Simulation of the stress-deformed state of the axial cutting tool by the finite element method”], Naukovi notatky [Scientific Notes], no. 63, pp. 235–240, 2018. [in Ukrainian].
 P. J. Arrazola, T. Ozel, D. Umbrello, M. Davies, I. S. Jawahir, “Recent advances in modelling of metal machining processes”, CIRP Annals – Manufacturing Technology, vol. 62, pp. 695–718, 2013.