A new method for roundness control in taper turning using FCC techniques

This paper describes a methodology, of online measuring and compensating sp indle error motions without using a precalibrated master. The method is bas ed on a combination of forecasting compensatory control (FCC) and error sep aration techniques. The real time recursive ARMA modeling technique is used for the modeling and forecasting of workpiece errors while the error compe nsation is performed by means of two-dimensional piezo-actuated tool moveme nts. Experimental results have shown that an improvement of 42-47 percent w as achieved for the roundness error of workpieces in the taper turning oper ations.