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A new NC instruction (G code) for 5-axis direct interpolation of NURBS surfaces is proposed. The mechanisms of the transferring of manufacturing information and of the processing of them are also presented. The proposed method solved the problem of the absence of the normal vectors of cutter contact points and the tangent vectors of tool path on the surfaces to be machined as a result of the approximation...
Generally, free-form surfaces are machined using the following procedures: by a CAM postprocessor a free-form surface is approximated into a number of smaller straight lines or curves to send a CNC system in the form of G/M code, which focuses on the constant speed of cutter location point instead of the constant speed of cutter contact point. These methods lead to low machining efficiency and accuracy...
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