Method and apparatus for positioning a work piece on a machine tool at an angle by the use of a laser beam

摘要

The invention concerns a method of precisely setting a workpiece (3) having a non-circular contour in a predetermined angular position. The workpiece (3) is placed in the path of a mobile laser beam (F) produced by a laser generator (10) and sweeping an area (P) in which the workpiece produces a shaded zone (Z) whose width (L) depends on the orientation of the workpiece. The width (L) is measured by a laser receiver (11) and the workpiece is turned until the measured width reaches a reference value (L1) when the workpiece is in the desired predetermined position. This method is advantageously used for angularly positioning, with a precision of about a 6 minute arc, a roughly-cut drill bit in a grinding machine for sharpening its tip.