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ISSN 1068?798X, Russian Engineering Research, 2010, Vol. 30, No. 1, pp. 72–76. ? A llerton Press, Inc., 2010. Original Russian Text ? . Kiri lin, . Eremin, 2009, published in STIN, 2009, No. 10, pp. 8–12. 72 The dynamic characteristics of the supporting sys? tem for a wheel?boring machine are calculated on the basis of ANSYS software and the methods in [1–3]. putational model has been developed for the supporting system of a KRS2791 machine (Fig. 1). putational models are developed for the ponents—welded and well?defined shells. Accordingly, shell finite elements are used in develop? ing the putational models. The models in Fig. 2 correspond to the mendations in [2, 3]. The KRS2791 wheel?boring machine is specially designed for the machining of one?piece rolled rail? road wheels. Such wheels correspond to a large 450?kg blank. Consequently, putational model of the wheel (Fig. 2f) must be taken into account in ? putational model of the machine’s supporting system. Operational experience with the wheel?boring machine shows that its spindle has the greatest influ? ence on the characteristics of the whole machines. Hence, a more putational model must be developed for the spindle unit. In contrast to classical boring machines, the spin? dle unit of the KRS2791 machine has plex con? figuration: it consists of the basic spindle within which there is a smaller oscillating spin