Heavy vertical boring and turning mill with two tool carriages displaceable on the cross beam and having ram slides and tool holders, in particular for machining railway wheels, in which the ram-slide guides (4, 5) (Z-axes) are rigidly fastened with their ram slides (6) to the tool carriages (3) (X-axis), displaceable in a sliding manner by means of hydrostatic guide systems on the cross beam (2), at an angle ( alpha ) of between 15 DEG and 40 DEG to the vertical so that their tool holders (7) with their turning tools (8) can be moved together in their working area until mutual contact takes place and at the same time a sufficiently large intermediate space (5) remains between the inner edges of the tool carriages (3) for a cross-beam guideway cover (10) variable in width, and that the two machining units consisting of ram-slide guide (4, 5), ram slide (6) and tool carriage (3) can be program-controlled in the X- and Z-axes by means of NC-devices (12) together or independently of one another for any paths of movement of the turning tools (8). IMAGE
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