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A decompositionbased approach to layered manufacturing
, 2002
"... This paper introduces a new approach for improving the performance and versatility of Layered Manufacturing (LM), which is an emerging technology that makes it possible to build physical prototypes of 3D parts directly from their computer models using a “3D printer ” attached to a personal computer. ..."
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Cited by 4 (2 self)
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This paper introduces a new approach for improving the performance and versatility of Layered Manufacturing (LM), which is an emerging technology that makes it possible to build physical prototypes of 3D parts directly from their computer models using a “3D printer ” attached to a personal computer. Current LM processes work by viewing the computer model as a single, monolithic unit. By contrast, the approach proposed here decomposes the model into a small number of pieces, by intersecting it with a suitably chosen plane, builds each piece separately using LM, and then glues the pieces together to obtain the physical
Computing an optimal hatching direction in layered manufacturing
 SUBMITTED TO COMPUTATIONAL GEOMETRY: THEORY AND APPLICATIONS
, 2001
"... In Layered Manufacturing (LM), a prototype of a virtual polyhedral object is built by slicing the object into polygonal layers, and then building the layers one after another. In StereoLithography, a specific LMtechnology, a layer is built using a laser which follows paths along equallyspaced para ..."
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In Layered Manufacturing (LM), a prototype of a virtual polyhedral object is built by slicing the object into polygonal layers, and then building the layers one after another. In StereoLithography, a specific LMtechnology, a layer is built using a laser which follows paths along equallyspaced parallel lines and hatches all segments on these lines that are contained in the layer. We consider the problem of computing a direction of these lines for which the number of segments to be hatched is minimum, and present an algorithm that solves this problem exactly. The algorithm has been implemented and experimental results are reported for realworld polyhedral models obtained from industry.
Manufacturing processes
 Handbook of Discrete and Computational Geometry, chapter 46
, 1997
"... This chapter surveys some recent work on the application of techniques from computational geometry to geometric problems arising in manufacturing processes such as layered manufacturing, mold design, and numerically controlled machining. Within each topic, we discuss problems that have benefited fro ..."
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This chapter surveys some recent work on the application of techniques from computational geometry to geometric problems arising in manufacturing processes such as layered manufacturing, mold design, and numerically controlled machining. Within each topic, we discuss problems that have benefited from the application of geometric
Double Sided Layered Manufacturing
, 2002
"... Many layered manufacturing technologies require building a sacrificial structure to support overhanging geometry during part fabrication. Often this support structure accounts for a significant fraction of the build time and raw materials used. In this paper, we introduce a new "doublesided&qu ..."
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Many layered manufacturing technologies require building a sacrificial structure to support overhanging geometry during part fabrication. Often this support structure accounts for a significant fraction of the build time and raw materials used. In this paper, we introduce a new "doublesided" paradigm for layered manufacturing with the potential to significantly reduce the time and material requirements for building the support structure for a large class of geometries.
Heuristics for Estimating ContactArea of Supports in Layered Manufacturing
"... Layered Manufacturing is a technology that allows physical prototypes of threedimensional models to be built directly from their digital representation, as a stack of twodimensional layers. A key design problem here is the choice of a suitable direction in which the digital model should be oriente ..."
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Layered Manufacturing is a technology that allows physical prototypes of threedimensional models to be built directly from their digital representation, as a stack of twodimensional layers. A key design problem here is the choice of a suitable direction in which the digital model should be oriented and built so as to minimize the area of contact between the prototype and temporary support structures that are generated during the build. Devising an efficient algorithm for computing such a direction has remained a difficult problem for quite some time. In this paper, a suite of efficient and practical heuristics is presented for estimating the minimum contactarea. Also given is a technique for evaluating the quality of the estimate provided by any heuristic, which does not require knowledge of the (unknown and hardtocompute) optimal solution; instead, it provides an indirect upper bound on the quality of the estimate via two relatively easytocompute quantities. The algorithms are based on various techniques from computational geometry, such as rayshooting, convex hulls, boolean operations on polygons, and spherical arrangements, and have been implemented and tested. Experimental results on a wide range of realworld models show that the heuristics perform quite well in practice. 1