following steps:
transferring workpieces on a workpiece carrier into a loading space of a working space;
picking up workpieces from the workpiece carrier by means of a first gripping device between displaceable and transverse in longitudinal direction and in vertical direction of a two-dimensional gantry which comprises a first linear axis extending in longitudinal direction of the working space, and a second linear axis extending in transverse direction of the working space and being coupled with the first linear axis;
displacing the workpieces to a second gripping device being displaceable along a gantry which connects the working space with a machine tool allocated thereto which has a main time for machining a workpiece and an idle time for loading and unloading of workpieces;
within the main time transferring a workpiece by meansof the second gripping device from the working space toward the machine tool;
within the idle time turning over the workpiece to the machine tool and receiving a machined workpiece from the machine tool;
within the main time displacing the workpiece received from the machine tool into the working space;
within the main time receiving a workpiece from the second gripping device by means of the first gripping device and displacing toward the workpiece carrier;
wherein the first gripping device within the main time turns over and receives workpieces between at least one supplementary station, such as an aligning station, a pre-measuring station, a final measuring station, a tilting/reversing station, a cleaning station or a support station, and between the workpiece carrier and vice versa.
In this way according to the invention the