A cutting force induced error elimination method for turning operations

The aim of this study is to compensate the cutting force induced dimensional workpiece errors in CNC turning operations. In realising this, a strain gauge based cutting force dynamometer is designed and constructed. Cutting forces are measured and recorded by a computer for standard specimens under various machining conditions. Empirical equations between the diameter errors and cutting forces are established experimentally. A compensation method based on computer-aided generation of an alternative tool path, which is symmetrically inversed to error characteristics, is developed. The model was developed initially for unidiameter case and then adapted to other workpiece geometries. The validity and reliability of the compensation method is examined by the Chi Square test method. The developed approach reduced the cutting force induced workpiece diameter error by 90% approximately.