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The purpose of this work was an analysis of factors affecting the form accuracy of holes obtained in the course of finish milling with a circular interpolation. To achieve the purpose in the work there is of-fered an application of theoretical methods (analysis, synthesis, comparison, abstracting, generalization, in-duction, deduction, modeling and others) and also em-pirical methods (observation, measurement, experiment, forecasting). On the basis of experimental investigation results it was defined that an index of deviation from a circle is influenced considerably by such geometrical and technological parameters of an end-milling cutter as a penetration radius, an angle of the initial point of a penetration radius and a feed set at tool penetration into blank material. For the parameters mentioned above and with the purpose of the optimum range definition in the choice of their values and for the increase of machining accuracy there is carried out a multifactor regressive analysis the result of which became a regressive model and a diagram of its surface characterizing it. It should be essential to mention that in the course of the analysis of the value of the deviation from a cylinder form there was developed and tested a simulator of cutter elastic deformation during the strategy of milling with a circular interpolation a maximum discrepancy of experimental and theoretical values made 15%.