In a method for operating a machine tool (20), having a numerical control (30) and several position-regulated axes for moving a tool (1) relative to a workpiece (5), with tool data for determining a tool model in the numerical control (30) , Workpiece data for determining a workpiece model and machine data for determining a machine model are recorded and, taking into account the tool model, the workpiece model and the machine model, the movements of the tool (1) relative to the workpiece (5) are simulated to detect collisions, that in the tool data, data relating to the geometry of at least one cutting part (S) of the tool (1) and data relating to the geometry of at least one non-cutting part of the tool (1) are recorded, based on the data relating to the geometry of at least the non-cutting part of the Tool (1) collisions of the non-cutting end part of the tool (1) with the workpiece (5) can be recognized.;This improves and simplifies collision detection.
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