Journal
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
Volume 99, Issue 1-4, Pages 1003-1012Publisher
SPRINGER LONDON LTD
DOI: 10.1007/s00170-018-2506-8
Keywords
Location error; Squareness error; Homogeneous transformation matrix; Sphere artifact; Touch trigger probe; Four-axis machine tools
Funding
- Industrial Core Technology Development Program - Korea Ministry of Trade, Industry and Energy (MOTIE) [10052978]
- Research Program of Korea Institute of Machinery and Materials [NK202E]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10052978] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [NK202E] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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One of the major sources of error affecting the accuracy of multi-axis machine tools is location error. Squareness errors and offset errors affect the locations of tool components. These errors depend on how accurately the machine tool was assembled and are independent of the positions of the affected components inside the machine tool. In this study, we developed a new method to identify all seven possible location errors in four-axis machine tools comprising three linear and rotary axes. A touch trigger probe installed on the tool axis is used to measure the locations of the centers of sphere artifacts as they are rotated through equal angles by the rotary axis. The measured centers are represented as command positions and the seven location errors using the homogeneous transformation matrix in the machine reference coordinate system. With this approach, every location error can be determined from the measured locations of the centers of the sphere artifacts. We validated our proposed method by performing experiments on a four-axis machine tool; additionally, we measured the three squareness errors between the three linear axes using a square master and a capacitive displacement sensor and compared the results with the values calculated using our proposed method.
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