A joint project of NCMS called Volumetric Accuracy for Large Machine Tools (VALMT), partnering Automated Precision, Boeing, Siemens and Mag Cincinnati, has pioneered an innovative process and established new methodology in volumetric error compensation for large machine tools. Volumetric error compensation, or VEC, is a true volumetric calibration that improves close tolerance and working accuracy of complex five- and six-axis machine tools throughout their entire working envelope.

Volumetric error compensation uses API’s T3 Laser Tracker and patented Active Target to precisely calibrate large machine tools in a matter of hours. Using a single set-up, the laser tracker performs continuous measurements to map the machine tool as it moves throughout its entire working volume. The measurements are done in a single coordinate system rather than along three axes, resulting in a true volumetric map of the machine tool’s accuracy. Advanced VEC software then processes the data in a matter of minutes. This software has the ability to simulate the entire machine tool path, graphically display the volumetric error, calculate compensation tables, verify the compensation values, and upload them directly to the controller.

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