Meaning
Telescopic sensors used during diagnostic procedures map circularity and geometric errors in the workspace. The double-ballbar test involves a precision rod with spheres at each end that mounts between the machine spindle and a magnetic cup on the table. As the machine performs a programmed circular path, the sensor measures minute deviations in the radius of the circle.
Error Identification
Analyzing the plot of the circular motion reveals specific mechanical issues like backlash, scale mismatch, lateral play or squareness errors. Each problem produces a characteristic shape in the data, such as a bump at an axis reversal or an ovality. This method allows technicians to diagnose hardware problems without disassembling the machine.
Calibration Benefit
Routine testing provides a baseline for the health of the equipment over its service life. By comparing current results to those from the initial installation, maintenance teams identify wear in the bearings or guideways. The data supports the creation of compensation values for the controller.
Verification Speed
Quick execution makes the procedure a preferred method for periodic quality checks. The entire double-ballbar test often takes less than twenty minutes to set up and run. It functions as a rapid validation of the machine performance before starting a critical production batch.
