Universal real-time NURBS interpolator on a PC-based controller

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[1] Wang, Jun-Bin
[2] Yau, Hong-Tzong
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Yau, H.-T. (imehty@ccu.edu.tw) | 1600年 / Springer London卷 / 71期
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It is complex and divergent for the conventional motion controllers to process various G codes using different interpolation algorithms. This impairs programming efficiency and robustness of the controller. In this paper; we propose the universal non-uniform rational B-splines (NURBS)-based interpolator which can simplify the architecture of interpolation in spite of interpreting different kinds of inputs. Direct conversion of long G01 and G02/G03 numerical control (NC) segments to NURBS segment is first implemented. The fitting of multiple short segments into a continuous and smooth NURBS segment is then carried out. More importantly; the universal NURBS-based interpolator utilizes the Cox-de Boor algorithm which is highly efficient and can take advantage of the parallel computing scheme to accelerate the processing speed. Furthermore; due to the construction of real-time environment; the proposed algorithm enables interpretation; look-ahead functions; and motion control to work simultaneously. A 2D NC program possessing hundreds of short G01 segments and long segments (i.e; G02; G03; and long G01) is tested on an in-house developed XY-table with a PC-based motion controller. The results have shown the effectiveness and feasibility of the proposed real-time NURBS-based interpolator. © 2013 Springer-Verlag London;
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