Salah H R Ali1，M G El-Sherbiny2
(1. Engineering and Surface Metrology Department, National Institute for Standards (NIS), Giza 12211-136, Egypt;2. Mechanical Design and Production Engineering Department, Faculty of Engineering, Cairo University, Giza 12613, Egypt)
Abstract： Form error measurement is a critical exercise in providing measures for the quality control in the precision manufacturing industry. Coordinate measuring machine (CMM) is one of the automated systems used in the accurate and precise dimensional measurements and geometrical form. This paper aims to study the effect of dynamic original unforeseeable errors at different undulations per revolution (UPR) of standard artifact measurement using selected two types of CMM touch-triggering stylus. Stylus-type and stylus-speed parameters were adopted and utilized throughout the course of experiment. The results are analyzed using fast Fourier transformation to obtain foreseeable geometrical errors due to CMM machine structure and stylus scanning speeds. The results of experiment successfully indicate that the number of UPR plays an important role in determining the CMM accuracy level of the roundness measurement result. Some specific error equations for stylus system and machine structure responses have been postulated and analysed to empirically predict the accuracy of PRISMO-Bridge-CMM-type at National Institute for Standards (NIS) in egypt.
Key words： coordinate metrology; undulation per revolution (UPR) analysis; cooridinate measuring machine (CMM); stylus speed error
CLD number： TG806 Document code： A
Article ID： 1674-8042(2014)01-0001-09 doi： 10.3969/j.issn.1674-8042.2014.01.001
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基于坐标测量机的几何误差测量分析
Salah H R Ali1，M G El-Sherbiny2
(1. Engineering and Surface Metrology Department, National Institute for Standards (NIS), Giza 12211-136, Egypt; 2. Mechanical Design and Production Engineering Department, Faculty of Engineering, Cairo University, Giza 12613, Egypt)
摘要:测量形状误差是精密制造业质量控制的关键部分。坐标测量机（CMM）是自动化精确测量维度尺寸和几何形状的机器。本文选用两种类型的坐标测量机触发探针进行标准工件测量，旨在研究不同的每转波数（UPR）时不可预见的动态固有误差的影响。整个实验过程使用探针类型和探针速度参数，采用快速傅立叶变换分析实验结果，得到受CMM机械结构和探针扫描速度影响而可预见的几何误差。实验结果表明，UPR的数量在进行圆形测量时对CMM准确度水平起非常重要的作用。本文对探针系统和坐标测量机结构响应的具体误差公式也进行了假设与分析，以经验数据来预测PRISMO-Bridge-CMM在NIS中的准确度。
关键词:坐标测量； 每转波数(UPR)分析； 坐标测量机和探针的速度误差
引用格式：Salah H R Ali， M GEl-Sherbiny. Error separation in CMM coordinate metrology. Journal of Measurement Science and Instrumentation, 2014, 5(1): 1-9. [doi: 10.3969/j.issn.1674-8042.2014.01.001]
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