• Title/Summary/Keyword: STL

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MIMS: Web-based Micro Machining Service (MIMS: 웹기반 마이크로 머시닝 서비스)

  • Chu W.-S.;Ahn S.-H.;Kim D.-S.;Jun C.-S.
    • Korean Journal of Computational Design and Engineering
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    • v.9 no.3
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    • pp.246-252
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    • 2004
  • Presented in this Paper is a Micro Machining Service .(MIMS) based on the World Wide Web technologies. In order to ensure easy access to the service, the web browsers are used as the user interface. The pan geometry as an STL file is uploaded with process parameter for 3-axis CNC milling. Depending on the predefined user level, novice or expert, the user interface requires different parameters for process planning. An STL-based CAM resides in the server and automatically provides NC codes upon user's request. Tool-paths for scanning and pencil-cut, which are interference-free and precise, are created by the curve-based polyhedral machining method. A couple of sample parts were fabricated by a micro endmill with 127 fm diameter. From the tests, the parts fabricated by scanning followed by pencil-cut resulted in less error(within 2%) than the parts machined only by scanning tool-path.

Development of a Dedicated CAM System for Human Bust Machining (흉상환조가공 전용 CAM 시스템 개발)

  • 정회민;박준철
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.7-10
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    • 2001
  • We have developed a prototype dedicated CAM system for machining a human bust that is not a relief. The input is STL file format, and the output is NC-codes for machining on a 3-axis general purpose CNC milling machine with an index table attached. Main modules are STL import, STL transformation, modeling jig/fixture, master model generation, and calculation of machining area. System architecture is proposed and main modules are briefly described. We adopted the angle between tool-axis and the surface normal vector to calculate machining area, and tested at several degrees.

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Optimization of Build Parameters in SLS Process (SLS의 공정 파라미터 최적화에 관한 연구)

  • Heo, Seong-Min;O, Do-Geun;Choe, Gyeong-Hyeon;Lee, Seok-Hui
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.3 s.174
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    • pp.769-776
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    • 2000
  • RP(Rapid Prototyping) technology is gaining its popularity in building a prototype in all industries. SLS(Slective Laser Sintering) is one of RP technologies, which is focused on tooling processes as well as three dimension solid model. There are several factors, the length and the cross-sectional area of a part, that have an effect on build setup in SLS process. In this paper, the computation on geometrical relationship is used to slice STL file and to estimate these factors. Based on these values, the build setup parameters such as the heating temperature, the laser power, and the powder cartridge feed rate are determined by neural network approaches. The test results show that the computation time is saved and the neural network approach is able to apply to get the optimal parameters of build process within an acceptable error rate.

The Application of Delaunay Triangulation on RP (Delaunay 삼각형 분합법의 RP에의 응용)

  • 김대원
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1998.03a
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    • pp.129-134
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    • 1998
  • STL which is used in Rapid Prototyping is composed of a lot of triangular facets. The number of triangles and the shapes of these triangles determine the quality of STL. Therefore, proper algorithm is necessary to enhance the quality of triangular patch. In this paper we used the Delaunay triangulation method to apply to following processes. 1) On processing for reducing sharp triangles which cause errors on intersection. 2) On processing for connecting two or more collinear edges. 3) On processing for deleting unnecessarily inserted points in coplanar polygon.

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Comparison of Panel STLs for Ships Measured in Laboratory and Mock-up (선박용 판넬의 음향투과손실(STL)의 실험실법 측정과 Mock-up 측정값의 비교)

  • Kim, Hyun-Sil;Kim, Bong-Ki;Cha, Sun-Il;Kim, Young-Soo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11b
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    • pp.69-72
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    • 2005
  • In this paper, FSTL(field sound transmission loss) measured in the mock-up is studied and compared to the STL measured in laboratory. A mock-up is built by using 6t steel plate, and two identical cabins are made where 25t or 50t panel is used to construct wall and ceiling inside the steel structure. Various wall panels and ceilings are tested, where the effects of U/T, sealing, panel thickness, ceilings are studied. It is shown that the effect of ceiling thickness is negligible and FSTL is lower than STL by 5-7 dB due to several flanking paths.

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RP Preprocessor Based on Distributed Objects (분산객체를 응용한 RP Preprocessor의 기능 구현)

  • 지해성;이승원
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.2
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    • pp.120-128
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    • 2003
  • When considering the use of rapid prototyping (RP), there are many issues a designer has to address for handling an STL model, the de facto standard fur RP. Today designers can skip all these issues by visiting web-based service bureaus that readily supply needed information for the RP services. Since orders are taken for RP parts through the web page of service providers designers are now asked to upload their STL files to the company server either by direct upload, ftp file transfer, or as an e-mail attachment. If the service bureau, however, fixes or edits an STL filceto optimize the RP process but neglects to tell its customer about the rework in detail, it may cause problems down the line in processing of the original CAD data for other applications. In this paper, we propose a framework for a collaborative virtual environment between CAD designers and RP processes on the internet which directly provides designers with an advanced preprocessor functionality, design visualization, as well as model display, repair, and slicing over the network. This can help smooth data transfer from CAD to RP process with minimum inconsistency in CAD.

A Study on Rapid Prototyping using VRML Model (VRML 모델을 이용한 쾌속조형에 관한 연구)

  • 김호찬;이주호;반갑수;최홍태;이석희
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.7
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    • pp.63-73
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    • 2000
  • Internet becomes very common tool for communication and data sharing. Virtual reality(VR) on web browser, and virtual prototyping and virtual manufacturing is widely used in many engineering folds. The reduction of overall development process and error minimization during data conversion becomes very crucial where sharing data via Internet and VR. This paper deals with the advantage and disadvantage of VRML format used in RP(Rapid Prototyping), and a software for RP data preparation is developed. If VRML format as an international standard for VR, is replaced with STL format, the weak points of STL format can be overcome and the technique related to virtual prototyping and virtual manufacturing can be addressed more systematically by sharing the data. The system developed in this work shows a good window to get access to a more realistic observation of an object fur an RP system from a long remote sites in a more systematic way.

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Offset of STL Model Generated from Multiple Surfaces (열린 STL 모델의 옵셋 방법)

  • Kim Su-Jin;Yang Min-Yang
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.7 s.184
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    • pp.187-193
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    • 2006
  • This paper introduces and illustrates the results of a new method for offsetting the triangular mesh generated from multiple surfaces. The meshes generated from each surface are separated each other and normal directions are different. The face normal vectors are flipped to upward and the lower faces covered by upper faces are deleted. The virtual normal vectors are introduced and used to of feet boundary. It was shown that new method is better than previous methods in offsetting the triangular meshes generated from multiple surfaces. The introduced offset method was applied for 3-axis tool path generation system and tested by NC machining.

A Study on RP Part Production Using New Circle Approximation Method (새로운 원 근사방법을 적용한 RP Part 제작에 관한 연구)

  • 홍민성;신근하;박시준;최상련;오철호
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1999.05a
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    • pp.81-86
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    • 1999
  • The STL file format is an approximation of 3-D model with triangular facets. STL is a standard input file format of Rapid Prototyping(RP) equipment. In computer graphics, a circle has been approximated with an inscribed polygon, which causes an error between the real and approximated circles. In this study, an intersecting polygon has been used to approximate the circle and applied to produce more accurate RP part. The newly proposed method shows it's excellence in part accuracy.

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Effect of the measurement error of reverberation time on the STL (잔향시간 측정 오차의 차음손실에 대한 영향)

  • 신성환;이정권;강현주
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.11b
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    • pp.1099-1103
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    • 2001
  • In room acoustics, reverberation time (RT) is the most important and general factor that represents character of room or inner space. However, RT, especially in low frequency range, can have the different value according to the measuring points and methods. This study comprehends the cause of error occurring dominantly in low frequency range when RT is measured and examines that the each error of RT measured in the cabin and reverberation chamber having different properties, influences what extent on sound transmission loss (STL)

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