• Title/Summary/Keyword: STL File

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The Study on Reduction of Scanning Path Build Time According to Control of STL file Slicing Height - Application of Small Jewellery (STL File 슬라이싱 높이 조정에 따른 주사경로 생성시간 저감에 관한 연구 - 소형 보석류에 적용)

  • Kim Tae Ho;Kim Min Ju;Lee Seung Soo;Jeon Eon Chan
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.12
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    • pp.205-210
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    • 2005
  • This paper addresses the correlation between the change of file size and the scanning path build time by the slicing height of STL file. Though the study about STL file has been achieved quite actively scanning path build time using STL file is not investigated so much to be satisfied. The file size depends on the number of polygon created by the slicing height specified. And this number of polygons increases in a regular rate. The correlation between the number of polygons and the scanning path build time is examined and verified.

The Study on the Reduction of Laser Scanning Path Creation Time during Jewellery Pattern Manufacturing (쥬얼리 패턴제작시 주사경로생성시간 단축에 관한 연구)

  • Kim, T.H.;Kim, S.Y.;Park, J.D.;Kim, M.J.;Jeon, E.C.
    • Korean Journal of Computational Design and Engineering
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    • v.11 no.6
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    • pp.440-446
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    • 2006
  • This study relates to the effect of forming time of injection path on the total process. The whole process can be divided into build process of forming path of injection and after treatment process. The total time required for the whole process could be reduced by reducing the forming time of injection path using SLC file to correct the problems of STL file that is the basic file format for high speed molding devices. First of all, I verify the forming time of injection path according to the conditions of STL file during the formation of injection path. And I verify problems using STL file during formation of injection path. And then I tried to solve problems of STL file by comparing between the formation time of injection path and the existing method using SLC files.

A study on conversion of cross-sectional information form STL file for Stereolithography (Stereolithography를 위한 STL파일로부터 단면정보 변환에 관한 연구)

  • 최홍태;김준안;이석희;백인환
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.445-450
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    • 1995
  • This paper deals with conversion from STL file to Slice cross-sectional information for Stereolithography. The STL file consist of three vertices of triangle and normal vectors in order to represent three dimension shape, but It is very difficult to convert STL file intoSlice file directly, because of file size from one Mbyte to tens of Mbytes. So, The system is accomplished data flow such as neutral.dat, .SL1, .SL2, .SL3, and .SLC file. The data processing is as follows: 1. Create a neutral file including common information. 2. Modify STL file within effective scope of SLA. 3. Calculate a point of intersection between plane equation and line equation. 4. Sort z values by increasing order. 5. Search closed loop by method of singlylinked linear list. The system is developed by using Borland C++ 3.1 compiler in the environment of Pentium PC. We get a satisfactory prototype as a result of application about a lot of household electrical appliances.

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Comparative study of two CAD software programs on consistency between custom abutment design and the output (두 가지 CAD software의 맞춤형 지대주 디자인과 출력물 일치도 비교)

  • Lim, Hyun-Mi;Lee, Kyu-Bok;Lee, Wan-Sun;Son, KeunBaDa
    • Journal of Dental Rehabilitation and Applied Science
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    • v.34 no.3
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    • pp.157-166
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    • 2018
  • Purpose: This study was aimed to compare the consistency between the custom abutment design and the output in two CAD software programs. Materials and Methods: Customized abutments were designed by using 3Shape Dental System CAD software and Delta9 CAD software on a plaster model with implants (CRM STL file). After milling of the designed abutments, the abutments were scanned with a contact method scanner (Test STL file). We overlaid the Test STL file with each CRM STL file by using inspection software, and then compared the milling reproducibility by measuring the output error of the specimens from each CAD software program. Results: The Delta9 showed better milling reproducibility than 3Shape when comparing the milling errors obtained with a full scan of all specimens (P < .05) and also when comparing the axial wall region specifically according to the axial angle. With 0.9 mm marginal radius, the Delta9 showed better consistency between the design and the output than 3Shape (P < .05). While, anti-rotation form had no significant difference in error between the two systems. When cumulative errors were compared, the Delta9 showed better milling reproducibility in almost cases (P < .05). Conclusion: Delta9 showed a significantly smaller error for most of the abutment design options. This means that it is possible to facilitate generation of printouts with reliable reproducibility and high precision with respect to the planned design.

A Study on the Improvement of Form Accuracy Using the Length Strain of Rapid Prototype (쾌속조형장치의 길이오차를 이용한 형상정밀도 개선에 관한 연구)

  • Kim Tae Ho;Park Jae Duk;Kim Min Ju;Lee Seung-Soo;Lee Jun Hee;Jeon Eon-Chan
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.12
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    • pp.154-159
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    • 2004
  • This study is aimed to diminish the errors which created during transforming from 3D shape created with CAD program to STL file formation. The length strain which created on X-Y axises at STL file transforming is diminished by using the relation between common shape error and shrinkage rate. As the result of study, we have confirmed the length strain in accordance with facetres value. Also, the shape error is compensated with shrinkage rate by error of length strain. so, we could diminish to shape error by several tens micrometer.

The study on the reducing of scanning path creation time using SLC file. (SLC파일을 이용한 주사경로 생성 시간 단축에 관한 연구)

  • 김태호;장성규;박정보;이준희;전언찬
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.114-118
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    • 2004
  • This paper is compared the build time of scanning path as to laminate height of the SLC and STL file. The STL file improve the surface roughness according to slicing height. But it have the fault spending long time to the creation of scanning path by being lower slicing height. So we proposed the SLC file to improve this fault. Therefore this paper showed to the build time of scanning path by the increase of peace using the jewellery model.

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Development of Stereolithography system using X-Y robot (X-Y 로봇을 이용한 광조형시스템 개발)

  • 김준안
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.5 no.4
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    • pp.18-25
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    • 1996
  • In this study, we have developed the stereolithography system that supports the development of a products. This paper presents the development of the stereolithography system. The system is composed of hardware, software and control part. The software converts a STL file to NC data and displays the monitoring figure in control part. The hardware part deals with structure of machine. The most important theme in this paper is LG-SLCAM software. This software can generate NC data and scanning condition data from a STL file semiautimatically. On the basis of three diensional shapes, it makes data for support structure from STL file. The effectiveness of using out stereolithography system is confirmed by processes of good development.

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A study on 3D data exchange between IGES and STL format (IGES와 SRL format 사이의 3차원 정보교고한에 관한 연구)

  • 오도근;최홍태;이석희
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.965-969
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    • 1995
  • This paper deals with effective using the IGES file for flexible data exchange among the other CAD/CAM system. If a data exchange between STL file and the neutral IGES file in Stereolithography system is available, a product design becomes more flexible. THere can be many restrictions and difficulties intranslating these data. First, an STL file follows two rules, such as right-hand rule, and vertex-to-vertex rule, thus requires a structural verification. Second, translation should be performed with minmal errors. It becomes very important to translate IGES file of limited kinds of entities fot the purpose of geometric information into STL file with minor data manipulation. The developed system suggests a good approach of translating the sampled B-spline surface of IGES and shows a potential linkage between IGES and STL format file.

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Verification of STL using the Triangle Based Geometric Modeler (삼각형기반 형상모델러를 이용한 STL의 검증)

  • 채희창
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.6 no.1
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    • pp.51-58
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    • 1997
  • The verification of the STL file is essential to build the confident parts using a RP machine, because the STL file obtained from the CAD software has many errors-the orientation of triangle does not coincide with adjacent triangles or some triangles are omitted, overlpped and so forth. Especially, the STL file translated from the surface model has more errors than those translated from the solid model. In this study, all possible errors were classified with the most general from and the causes of errors were analyzed to verify and correct errors. Using the triangle based non-manifold geometric modeling, these errors were corrected. Especially, this study took the notice of the problem about the intersected triangles and non-manifold properties overlooked in the previous studies. But this study has a penalty on computing time of $O(n^2)$.

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STL 포맷의 구멍 오류 수정을 위한 삼각형 분할법 적용에 관한 연구

  • 손영지;조연상;전언찬
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.889-893
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    • 1995
  • This paper verified error of STL file and presented a new application of reformed division method for reducing to appeared error by using Delaunay triangulation method that used to modify error of verified data. First, it is analyzed each vertices in hole error and classified follow case that is 1. case of plan or slope, 2. case of edge, 3. case of apex and 4. case of rapid curve, and reduced volume tolerance between original model and converted model after convert STL file.

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