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Improving the machine accuracy through machine tool metrology and error correction

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Abstract

Improving both the positioning accuracy and contouring accuracy of a vertical machining centre has been studied by using a machine tool metrology and in-house error correction techniques. Contouring errors caused by the servo lag and friction of servomechanisms were measured by the circular test and then reduced by off-line parameter tuning of the CNC and servo-driver. The quasistatic thermal errors were predicted online using a neural network based model which was calibrated in advance via a quick set-up and multiple-error measurement system consisting of a spindle-mounted probe and artifacts. Positioning errors caused by both the static geometric errors and thermal effects were eliminated in real-time by a PC based software error compensation scheme integrated with the CNC controller through digital communication. An error reduction of 70% was achieved after error compensation and CNC tuning.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Chung Cheng University, 160, San-Hsing, Ming-Hsiung, 621, Chia-Yi, Taiwan, Republic of China

    Jenq Shyong Chen & Cheng Chang Ling

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  1. Jenq Shyong Chen
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  2. Cheng Chang Ling
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Chen, J.S., Ling, C.C. Improving the machine accuracy through machine tool metrology and error correction. Int J Adv Manuf Technol 11, 198–205 (1996). https://doi.org/10.1007/BF01351325

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  • DOI: https://doi.org/10.1007/BF01351325

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