Machine calibration is critical to insure process monitoring will provide consistent indication of product quality across different machining platforms. Before sensor information is useful, characteristics such as machine accuracy, natural frequencies, and spindle run-out needed to be characterized. This information will help identify the sources of phenomenon that the sensors will measure. Develop a robust sensor calibration routine. Calibrating the sensors is critical to insuring that the information obtained is consistent and meaningful.
Power is measured directly thru current and voltage, therefore, no calibration is needed.
Calibration of the force sensors will be done by applying forces through a previously calibrated portable dynamometer to the process monitoring dynamometer and noting readings and adjusting discrepancies. The calibration methodology of vibration and acoustics are in progress.