Determining Setup Orientations From the Visibility of Slice Geometry for Rapid Computer Numerically Controlled Machining

Date
2006-02-01
Authors
Frank, Matthew
Wysk, Richard
Frank, Matthew
Joshi, Sanjay
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Abstract

A method for rapid computer numerically controlled (CNC) machining is being developed in an effort to automatically create functional prototypes and parts in a wide array of materials. The method uses a plurality of simple two-and-a-half-dimensional (21/2-D) toolpaths from various orientations about an axis of rotation in order to machine the entire surface of a part without refixturing. It is our goal to automatically create these toolpaths for machining and eliminate the complex planning traditionally associated with CNC machining. In this paper, we consider a problem that arises in automating this process - visibility to the surface of a model that is rotated about a fourth axis. Our approach involves slicing the computer-aided design (CAD) model orthogonal to the axis of rotation. The slice geometry is used to calculate two-dimensional visibility maps for the set of polygons on each slice plane. The visibility data provides critical information for determining the minimum number and orientation of 21/2-D toolpaths required to machine the entire surface of a part.

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<p>This article is from <em>Journal of Manufacturing Science and Engineering, Transactions of the ASME</em> 128 (2006): 228, doi: <a href="http://dx.doi.org/10.1115/1.2039100" target="_blank">10.1115/1.2039100</a>. Posted with permission.</p>
Keywords
machining, rapid prototyping, slice geometry, visibility
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