The measurement of forces in grinding in the presence of vibration

Most investigations of chatter have made the assumption that torsional vibr ation is not a significant factor. Some recent work has shown that chatter in grinding is affected by a change in the torsional stiffness of the workp iece drive. Also, a theoretical model of grinding chatter has been develope d that confirmed the significance of torsional effects. However, the model for the grinding force was assumed to be a dynamic equivalent of a publishe d steady-state model. This paper describes tests conducted to measure the v ariation in force caused by an oscillation in workpiece speed. The oscillat ing test results indicate that the torsional vibration of the workpiece may well be a significant effect on chatter in grinding. Moreover, as the grin ding force changes with workpiece speed, it may be possible to use variatio n of workpiece speed at high frequency to reduce chatter. (C) 2001 Elsevier Science Ltd. All rights reserved.