Note: Before running Convert, Explode any collection of NURBS curves that are joined into a set of curves. Run the Convert command on all curves in the file you want to send to the cutter. Set options to: Output= Arcs, SimplifyInput= No, AngleTolerance= 0, and Tolerance to a reasonable number for your model. You can use the Rhino Convert command for this process, commonly called “Arc Fitting”. Approximating splines by a series of tangent (or nearly tangent) arcs is generally preferable to just polylines, because they allow a more accurate cut with a smaller file and less possibility of slowdowns along the curves, especially with older machines. Control the approximation tolerance by using the correct settings during the conversion process. ![]() By convert, we mean that the spline curve is approximated by a polyline or polycurve containing only arc and line segments. So, to cut parts sucessfully, it is necessary to convert any free-form NURBS curves ( splines) in your file into a series of arcs and lines. A great many industrial cutting machines and software only understand lines and arcs.
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