An interpolation scheme for tool-radius compensated parabolic paths for CNC. (computer numerical control): An article from: IIE Transactions
Book Details
Author(s)O.H. Chai, Y.S. Wong, A.N. Poo
ISBN / ASINB00096JT5W
ISBN-13978B00096JT54
AvailabilityAvailable for download now
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This digital document is an article from IIE Transactions, published by Institute of Industrial Engineers, Inc. (IIE) on January 1, 1996. The length of the article is 3325 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: In general, NC systems provide only linear and circular interpolations. Complex shapes to be machined are first approximated with linear and circular segments to some predetermined tolerance. Parabolic curves are more suitable for piecewise approximation of higher-order curves because less segments than lines or circular arcs are required. In machining operations, the tool motion controlled by the interpolator does not move along the profile of the job. The tool path is offset from the profile by the tool radius. Tool-radius compensations for linear and circular tool paths involve simple offsets of the initial and final points. The tool paths remain linear or circular. For parabolic profiles, the offset tool paths are not parabolic; hence, parabolic interpolations cannot be used to generate the offset paths. This paper presents an algorithm to perform interpolations for the tool to follow parabolic curves as well as the offset paths passing through two user-defined end points. The parabolic interpolation is based on the principle of operation of the Digital Differential Analyzer (DDA) integrator and is capable of constant tangential velocity.
Citation Details
Title: An interpolation scheme for tool-radius compensated parabolic paths for CNC. (computer numerical control)
Author: O.H. Chai
Publication:IIE Transactions (Refereed)
Date: January 1, 1996
Publisher: Institute of Industrial Engineers, Inc. (IIE)
Volume: v28 Issue: n1 Page: p11(7)
Distributed by Thomson Gale
From the author: In general, NC systems provide only linear and circular interpolations. Complex shapes to be machined are first approximated with linear and circular segments to some predetermined tolerance. Parabolic curves are more suitable for piecewise approximation of higher-order curves because less segments than lines or circular arcs are required. In machining operations, the tool motion controlled by the interpolator does not move along the profile of the job. The tool path is offset from the profile by the tool radius. Tool-radius compensations for linear and circular tool paths involve simple offsets of the initial and final points. The tool paths remain linear or circular. For parabolic profiles, the offset tool paths are not parabolic; hence, parabolic interpolations cannot be used to generate the offset paths. This paper presents an algorithm to perform interpolations for the tool to follow parabolic curves as well as the offset paths passing through two user-defined end points. The parabolic interpolation is based on the principle of operation of the Digital Differential Analyzer (DDA) integrator and is capable of constant tangential velocity.
Citation Details
Title: An interpolation scheme for tool-radius compensated parabolic paths for CNC. (computer numerical control)
Author: O.H. Chai
Publication:IIE Transactions (Refereed)
Date: January 1, 1996
Publisher: Institute of Industrial Engineers, Inc. (IIE)
Volume: v28 Issue: n1 Page: p11(7)
Distributed by Thomson Gale
