Dynamic cutting force measuring

Piezoelectric dynamometer are generally used for force measuring. Delivered signals are distorted due to their self dynamic behaviour. Their dynamic characteristics are identified under normal machining operation. The proposed method is based on the interrupted cutting of a specially designed workpiece that provides a strong broadband excitation. The three components of the exciting force and the acceleration of the gravity centre of the dynamometer cover plate are measured simultaneously. Although the input acceleration components are correlated in the frequency bandwidth of interest, a method is presented to determine the nine terms of the dynamometer transfer matrix from only one cutting experiment. Series of different pulse excitations are carried out to validate the proposed method. Then, the determined transfer matrix is used for dynamic cutting force compensation under some milling operations. (C) 2000 Elsevier Science Ltd. All rights reserved.