Effective Dynamometer for Measuring High Dynamic Process Force Signals in Micro Machining Operations

The authors present an innovative piezoelectric dynamometer (MicroDyn) providing the base for measuring high frequency signals in micro machining operations. Cutting tools with one or more cutting edges used in micro machining processes are mostly running with rotational speeds of more than 100’000 rpm, resulting in high excitation frequency. Thus, the interference of the excitation frequency of those processes with the natural frequency of commercially available dynamometers makes it impossible to measure process forces within a wide frequency range. This paper presents the dynamometer design, results of various laboratory tests and first cutting force measurements taken from high dynamic cutting processes as single grain cutting.