Preeti Malakar, Thomas George, et al.
SC 2012
An NC system that machines a curved shape at fixed depth of cut experiences time-varying cutting forces due to the 'curvature effect' - the material removal rate is higher than nominal in concave regions, and lower in convex regions. A curvature-dependent feedrate function that automatically compensates for this effect is formulated, and it is shown that, for Pythagorean-hodograph (PH) curves, the periodic real time computation of reference points in accordance with this function can be analytically reduced to a sequence of root-finding problems for simple monotone functions. Empirical results from an implementation of this variable-feedrate interpolators on an open-architecture CNC milling machine are presented and compared with results from fixed-feedrate interpolators. The curvature-compensated feedrate scheme has important potential applications in ensuring part accuracy and in optimizing part programs consistent with a prescribed accuracy. © 1998 Elsevier Science Ltd. All rights reserved.
Preeti Malakar, Thomas George, et al.
SC 2012
William Hinsberg, Joy Cheng, et al.
SPIE Advanced Lithography 2010
Marshall W. Bern, Howard J. Karloff, et al.
Theoretical Computer Science
Alfonso P. Cardenas, Larry F. Bowman, et al.
ACM Annual Conference 1975