Patent ID: 7256898

Claim:
Method of determining the position of a rotationally drivable tool used in machining so that the position may be used in continued machining, having the following steps: providing a measuring beam ( 18 ), rotating a rotationally drivable tool ( 14 ), choosing a movement direction, moving the tool ( 14 ) in the chosen direction, away from the measuring beam ( 18 ), to a measuring position in which the tool ( 14 ) is separated from the measuring beam ( 18 ), detecting the measuring position, and determining the position of the tool ( 14 ) from the measuring position so that the position may be used in continued machining, wherein the tool ( 14 ) is positioned in the beam path of the measuring beam ( 18 ) before it is moved away from the measuring beam ( 18 ), and the measuring position is detected for a position of the tool ( 14 ) in which the measuring beam ( 18 ) is not interrupted during at least one revolution of the tool ( 14 ).