authors 
Lartigue, C. Thiebaut, F. and Maekawa, T. 
year 
2001 
title 
CNC tool path in terms of Bspline curves 
source 
ComputerAided Design, Vol. 33 (4) (2001) pp. 307319 
summary 
We present an accurate and efficient method to generate a CNC tool path for a smooth freeform surface in terms of planar cubic Bspline curves which will be fed into afreeform curve interpolator. We assume the use of a threeaxis CNC machine tool with a ball endmill cutter. We first interpolate break points, which are generated bycomputing the offset surfacedriving plane intersection curve reflecting the curvature, by a planar cubic Bspline 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 
FreeForm Curve Interpolator, CNC Machine Tool, Pick Feed, Scallop Height, Tool Path, Offset Surface 
series 
journal paper 
email 
tmaekawa@deslab.mit.edu 
references 
Contenttype: text/plain

last changed 
2003/05/15 19:33 
