Integrated Inspection and Compensation System for a CNC Turning Center

This paper presents an integrated inspection and compensation methodology to a CNC turning center for improving machined workpiece accuracy. On-machine inspection for workpiece, machining errors prediction, workpiece machining program adjustments and machining errors compensation are integrated in this methodology. Workpiece diameter errors due to the deflections of the machine-fixture-tool-workpiece (MFTW) system are studied and the errors are expressed in terms of a set of parameters and coefficients of unknown magnitudes. As the functions of the proposed method, the machined workpiece can be measured to determine the unknown coefficients included in the error models, then the machining errors are predicted and compensated. The effectiveness of the inspection and compensation technology has been shown through several machining experiments on the turning center.