Optimum Error Separation Technique for In-Situ Straightness Measurement in Diamond Turning
Abstract In diamond turning, measurement of a workpiece without removing it from the machine tool needs an in-situ metrology system and an error separation technique. The traditional methods for error separation have their limitation in straightness measurement. In this paper, a thorough analysis is given for the non-periodic effect on error separation, and a new method is described to overcome the limitation in straightness measurement for short workpiece. The new method enables the use of a sampling interval smaller than the one permitted by the traditional techniques and gives more detailed information about the measured workpiece profile. Consequently, it is suitable for the in-situ measurements of short workpieces in diamond turning.