in the x 1 or x 2 direction as well as the z 1 or z 2 direction is provided in this case the adjustability of the carrier in the x direction corresponds to the advance during the turning of the flat faces whereas the adjustability in the z direction serves to position the turning tools in their exact longitudinal position with respect to the incision into the respective journal region for simultaneous turning of opposing flat shoulders in order to make the machine appropriately flexible for different crankshafts it may be advantageous to divide the carrier into a plurality of parts in which case an adjustability in an x and a z direction must then be provided for each carrier as a result the turning centre is technical more costly and more complicated but it offers greater flexibility in its application to different requirements in the complete machining of crankshafts moreover the turning tools are individually adjustable which can be carried out manually or automatically the advantage of the arrangement of the turning tools 8 according to fig2 opposite one another is that forces which are introduced during turning and can lead to deformation of the crankshaft can be absorbed or compensated for by the opposing counterpart by this turning of the flat shoulders 9 regardless of bending in the region of the central journal 10 of the crankshaft 2 the precision of production of the crankshaft can be further improved as the turning tools are brought into engagement simultaneously on the crankshaft from two opposing sides in addition to.