Title: Analysis of straightness and flatness errors based on Python

Abstract

Calibration of surface plates becomes necessary demand in production metrology. These plates are considered as reference planes for many types of dimensional measurements. This study presents an analysis of straightness and flatness errors on the calibration of surface plates. A laser interferometer system is used in calibration of granite surface plate based on Union Jack method. The calibration is carried out using foot spacers of 2, 4 and 6 inches. A new method based on Python is proposed for statistical assessment of errors in each case. The sample size due to 4 inch foot spacer is most comparable for plate calibration. The associated uncertainties and measurement results are evaluated and compared.