Patent ID: 8630732

Claim:
A method for avoiding an unwanted collision between a tool and a workpiece in a machine tool, comprising the steps of: determining setpoint movement values based on a parts program, controlling a relative movement between the tool and the workpiece and determining material removal at the workpiece by the tool based on the determined setpoint movement values, when execution of the parts program is started, terminating or interrupting execution of the parts program to stop the relative movement, when the relative movement has stopped, determining a workpiece model based on the determined material removal, defining actual setpoint movement values based on a manual operating input, determining expected future setpoint movement values based on the actual setpoint movement values, determining a braking end arrangement of the tool based on the expected future setpoint movement values, determining a tool model based on the braking end arrangement of the tool and on a tool form model describing a geometric form of the tool, checking whether the tool model overlaps with the workpiece model, and when an overlap between the tool model and the workpiece model is detected, slowing down of the relative movement between tool and workpiece until the relative movement stops.