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ROUNDNESS MEASUREMENT CAPABILITY AND TRACEABILITY AT NIMT

Roundness measurement capability and traceability at the National Institute of Metrology (Thailand), NIMT, is discussed here. RTH Talyrond 73 HPR is used to measure various roundness parameters of the specimen. The modifications of the measurement system and analysis software were employed in order to perform roundness measurement based on multi-step method. This technique enables us to separate roundness error of the workpiece from the spindle error of the instrument. The measurement uncertainty for the glass hemisphere calibration using multi-step method is Q(8, 8 R) nm where R is the measured roundness error of the glass hemisphere in �m. The spindle error of the RTH Talyrond 73 HPR at NIMT up to 53 nm was observed.