Abstract
This paper deals with the dynamic motion errors with XY synchronous motions in NC machine tools in terms of gain tuning. By analytical calculations and computer simulations, it is shown that the differences of the velocity loop bandwidth as well as natural frequencies of feed drives cause the transient errors on linearly interpolated motions inclined from X axis by 45 degree. Compensation methods based on dynamical matching of each axis and the acceleration feedforward technique are proposed to avoid such kind of transient errors. Motion error traces are measured on several combinations of servo gains and found to be very close to the estimated ones, which suggests the effectiveness of the proposed gain tuning methods of velocity loop gains as well as acceleration feedforward gains.
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