Measurement of spindle thermal errors in machine tool using hemispherical ball bar test |
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| Authors: | Seung-Han Yang Ki-Hoon Kim Yong Kuk Park |
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| Affiliation: | a School of Mechanical Engineering, Kyungpook National University, #1370 Sankyuk-Dong, Puk-Ku, Daegu 702-701, South Korea;b School of Mechanical and Automotive Engineering, Catholic University of Daegu, Daegu, South Korea |
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| Abstract: | The assurance of top-quality products in machining processes requires improved machine tool accuracy. Among the various errors related to machine tools, thermal errors of a spindle have a significant effect on machining accuracy and directly influence both the surface finish and the geometric shape of the finished workpiece. Accordingly, the current paper proposes a new measurement method for spindle thermal errors in a machine tool based on the use of a ball bar system instead of the conventional capacitance sensor system. The novel measurement method is more efficient and easier to use compared to conventional measurement systems. Furthermore, a single ball bar system is sufficient for the simultaneous measurement of both geometric and thermal errors. |
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| Keywords: | Machine tool errors Volumetric error synthesis model Thermal errors of a spindle Ball bar test of hemispherical helix |
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