Length-Bar and Step-Gauge Calibration Using a Laser Measurement System with a Coordinate Measuring Machine

The most precise CMMs do not have the accuracy required to perform calibrations on length bars and step-gauges except by recourse to conventional comparison techniques. This paper describes an economical method for substantially upgrading the single-axis measurement accuracy of a precision CYM using a laser interferometer. The measurement results presented demonstrate that the system provides a practical and effective method to calibrate length bars and step-gauges. The uncertainty of measurement derived from the analysis of errors conforms to OIML order of accuracy class 1 requirements.