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authors Lartigue, C. Thiebaut, F. and Maekawa, T.
year 2001
title CNC tool path in terms of B-spline curves
source Computer-Aided Design, Vol. 33 (4) (2001) pp. 307-319
summary We present an accurate and efficient method to generate a CNC tool path for a smooth free-form surface in terms of planar cubic B-spline curves which will be fed into afree-form curve interpolator. We assume the use of a three-axis CNC machine tool with a ball end-mill cutter. We first interpolate break points, which are generated bycomputing the offset surface-driving plane intersection curve reflecting the curvature, by a planar cubic B-spline curve. We then evaluate the maximum scallop height alonga scallop curve by computing the stationary points of the distance function between the scallop curve and the design surface. Furthermore, we compute the maximum pickfeed such that the maximum scallop height along a scallop curve coincides with the prescribed tolerance. Illustrative examples show the substantial improvements this methodachieves over conventional methods where the tool path consists of linear or circular paths.
keywords Free-Form Curve Interpolator, CNC Machine Tool, Pick Feed, Scallop Height, Tool Path, Offset Surface
series journal paper
email tmaekawa@deslab.mit.edu
references Content-type: text/plain
last changed 2003/05/15 19:33
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