Abstract
Next generation of Geometrical Product Specifications (GPS) is the foundation of the technology standards and metrology specifications of mechanical and electric products. GPS estimation of uncertainty can make the results of verification of products reliable and can be compared globally. Flatness is an important geometrical feature of a product and has great influence to the product performance and assembly quality. The uncertainty in flatness three-dimensional measurements must be estimated according to GPS standards to assure the related functions of a product. According to t ISO/TS 14253-2, a calculation method of the uncertainty in flatness three-dimensional measurement by certain fitting method is proposed. The method was evaluated and improved according to Procedure for Uncertainty Management, which is given by next generation of GPS. The measurement process which can meet the target uncertainty was obtained at last.
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