• 제목/요약/키워드: Dimensional precision

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광조형법에 있어서 OFFSET정보생성 알고리즘 개발에 관한 연구 (A Study on Algorithm Development of Offset Data Generation in Stereolithography)

  • 김준안;홍삼열;백인환
    • 한국정밀공학회지
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    • 제13권9호
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    • pp.70-76
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    • 1996

  • In the Stereolithography process, three-dimensional objects are built by sequentially curing, generated by horizontal slicing of a three-dimensional CAD model. The dimensional accuracy of a menufactured part depends on the accuracy of curing performed by laser beam radius and the half of curing width. When offsetting, some slices have collinear segments, coincident vertices, line jerks and open loops. After remove above issues we have correct offsets data. And in last step, these data are used to scan paths.

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2차원 프로브에 의한 NC공작기계의 운동 정밀도 측정 -제2보 직선운동 정밀도 측정- (Measurement of Motion Accuracy by Two-dimensional Probe on NC Machine Tools -2nd Report, Measurement of the Linear Motion Accuracy-)

  • 전언찬;소산전중덕;제정신;각전윤일랑
    • 한국정밀공학회지
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    • 제14권7호
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    • pp.15-21
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    • 1997

  • This paper presented a linear motion accuracy by using two-dimensional probe with the master block and the square for NC machine tools. This measuring system could be measured motion error due to numerical control system. The results of measurement and simulation for motion error were similar, and so, this system had enough accuracy to measure a linear motion accuracy for NC machine tools. The experimental results are as follows. 1. This measuring system could be measured motion error due to mumerical control system. 2. The results of measurement and simulation for motion error were similar. 3. This measuring system had enough accuracy to measure a linear motion accuracy for NC machine tools.

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컴퓨터 비젼을 이용한 원기둥형 물체의 3차원 측정 (3-Dimensional Measurement of the Cylindrical Object Using Computer Vision)

  • 장택준;주기세;한민홍
    • 한국정밀공학회지
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    • 제12권12호
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    • pp.38-44
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    • 1995

  • This paper presents a method to measure the position and orientation of a Cylindrical Object(unknown the eiameter and length) lying on a floor, using a camera. The two extreme cross section of the cylinder will be viewed as distorted ellipese or circular are, while its limb edge will be shown as two straight lines. The diameter of the cylinder is determined from the geometric properties of the two straight lines, which in turn provides information regarding the length of the cylinder. From the 3-dimensional measurement, the 3D coordinates of the center points of the two extreme cross sections are determined to give the position and orientation of the cylinder. This method is used for automated pick-and-place operations of cylinder, such as sheet coils, or drums in warehouses.

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