Journal ArticleDOI
Parametric interpolator versus linear interpolator for precision CNC machining
Daniel C. H. Yang,Tom Kong +1 more
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TLDR
Results show that the parametric interpolator used for command generation during CNC machining is favourable in the machining of free-form geometry in terms of high speed and tight tolerancing.Abstract:
The paper presents a comparative study of linear and parametric interpolators used for command generation during CNC machining. For many decades, linear interpolators have been used in NC machines for command generation. Recently, a parametric interpolator has been developed that is designed for command generation for parametric curves (or surfaces). Two algorithms for the online implementation of this parametric interpolator are introduced. The comparison is mainly based on memory size, feedrate fluctuation and CPU time. Other considerations include tracking errors and jerk magnitude. Results show that the parametric interpolator is favourable in the machining of free-form geometry in terms of high speed and tight tolerancing.read more
Citations
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Journal ArticleDOI
Adaptive-feedrate interpolation for parametric curves with a confined chord error
Syh-Shiuh Yeh,Pau-Lo Hsu +1 more
TL;DR: Simulation and experimental results for non-uniform rational B-spline (NURBS) examples are provided to verify the feasibility and precision of the proposed speed-controlled interpolation algorithm with an adaptive feedrate.
Journal ArticleDOI
Development of a dynamics-based NURBS interpolator with real-time look-ahead algorithm
TL;DR: In this article, a real-time look-ahead (DBLA) algorithm is proposed to generate a smooth and jerk-limited acceleration/deceleration (ACC/DEC) feedrate profile.
Journal ArticleDOI
The speed-controlled interpolator for machining parametric curves
Syh-Shiuh Yeh,Pau-Lo Hsu +1 more
TL;DR: By deriving a compensatory parameter, the proposed interpolation algorithm has significantly improved curve speed accuracy and the motion accuracy and feasibility of the present interpolator have been verified with a provided non-uniform rational B-spline (NURBS) example.
Journal ArticleDOI
A parametric interpolator with confined chord errors, acceleration and deceleration for NC machining
Tsehaw Yong,Ranga Narayanaswami +1 more
TL;DR: Simulation results indicate that the offline detection of feed rate sensitive corners improves parametric interpolation.
Journal ArticleDOI
A constant feed and reduced angular acceleration interpolation algorithm for multi-axis machining
Robert Fleisig,Allan D. Spence +1 more
TL;DR: A new algorithm for off-line interpolation of the data points, followed by real-time axis command generation of splines that will be the same on any five-axis machine tool, hexapod, or robotic arm.
References
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Book
Computational Geometry for Design and Manufacture
I. D. Faux,M. J. Pratt +1 more
TL;DR: In this paper, the mathematical techniques for the representation, analysis and synthesis of shape information by computers are discussed, and splines and related means for defining composite curves and "patched" surfaces are discussed.
Journal ArticleDOI
NC machining of free form surfaces
Gregory C Loney,Tulga M. Ozsoy +1 more
TL;DR: The continuation of a trend towards more user-friendly, interactive CADCAM systems, prompted the creation of a prototype software package called CISPA (Computer Interactive Surfaces Pre-APT), which uses a menu-driven front end with graphical feedback to guide a user through curve and free form surface definition resulting in a mathematical model which may be used to generate NC machine CLSF.
Journal ArticleDOI
Command Generation for Three-Axis CNC Machining
Jui-Jen Chou,D. C. H. Yang +1 more
TL;DR: In this paper, the geometrical properties of a cutter path, including position, tangent, curvature and torsion are analytically related to the motion dynamics of a machine tool including feedrate, acceleration, jerk and driving force.
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Adaptive-feedrate interpolation for parametric curves with a confined chord error
Syh-Shiuh Yeh,Pau-Lo Hsu +1 more