Patent ID: 7482819

Claim:
A power tool for driving a working tool ( 3 ) that penetrates at least axially into a to-be-machined material ( 2 ), comprising a signal processor ( 6 , 6 ′) designed to determine a penetration depth (T) of the working tool ( 3 ) into the material ( 2 ) based on high frequency electromagnetic waves ( 4 ); and a transducer ( 5 ) suitable for exciting and detecting a high-frequency electromagnetic wave ( 4 ) propagating axially along the working tool ( 3 ), which is a waveguide of the electromagnetic wave, and connected to the signal processor ( 6 , 6 ′); wherein the transducer ( 5 ) is formed as a coaxial conductor system whose elongate inner conductor is formed at least partially by the high-frequency conducting power tool ( 3 ) and whose sleeve-shaped outer conductor is formed at least partially by a high-frequency conducting housing ( 7 ) of the power tool, the inner conductor and outer conductor being insulated from one another with respect to high frequency.