• Title/Summary/Keyword: spindle apparatus

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Measuring of Rotational Accuracy of Lathe Spindle (선반 주축의 회전운동 정도 측정)

  • Kim, Young-Seuk
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.6
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    • pp.43-48
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    • 2007
  • It is important to measure the rotational accuracy of lathe spindle as it affects to the qualities of all machines machined by the lathe using in industries. The bad rotational accuracy of lathe spindle are caused mainly by wearness of the spindle in using and quality of spindle when machining and using low level bearings. It occurs especially in case of lathes because the cutting force acting to work-piece act on one side to the spindle not to both sides symmetrically. Therefore in this study, constructing experimental apparatus for measuring of rotational accuracy by using eddy current type gap sensors AEC5706PS and sensors, s-06LN, data acquisition board DT9834(USB type) and software for data acquisition, DT Measure Foundry ver. 4.0.7 etc., error data acquired in the rotational accuracy test of lathe spindle are analysed in plots and statistical treatments.

Experimental Modal Analysis of Disk-Spindle System in Hard Disk Drive (하드 디스크 드라이브 디스크-회전체 계의 실험적 모드 해석)

  • 김철순;박종승
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 1998.04a
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    • pp.233-237
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    • 1998
  • In this work, to identify the dynamic characteristics of disk-spindle system in hard disk drive, experimental modal analysis was performed. And an experimental analysis system including testing apparatus, precision sensors, and analysis software was established in order to perform the testing effectively. From the experimental results, coupled and uncoupled modal characteristics of 3-disk spindle system are clearly identified.

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Heat Generation Characteristics of Whirling Spindle for Ball Screw Machining (볼스크류 가공용 선회형 스핀들의 발열 특성에 관한 연구)

  • Moon, Hong-Man;Kim, Sang-Won;Jeong, Ho-In;Lee, Choon-Man
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.10
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    • pp.44-51
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    • 2020
  • We studied the heating characteristics of a whirling spindle. This spindle is an important component of a whirling machine for turning a ball screw shaft. In the manufacturing process for a conventional ball screw shaft, a single tool is used to form a spiral in a lathe machine tool. Thereafter, a high-frequency heat treatment process is performed. Recently, a whirling-type cutting method has emerged. This method can perform hard turning in the rotating direction of the spiral portion of the ball screw shaft by rotating and mounting multiple tools. The whirling method can be applied to the heat-treated material. In this study, an experimental apparatus was constructed to analyze the whirling spindle. The experiment proceeded in four steps. The rotating speed of the whirling spindle was set to ISO random and sequential rising conditions. Cooling and non-cooling modes in the cooling jacket were tested. As a result of the above experiment, the heating characteristics of the whirling spindle were derived.

Monitoring of Eccentric Machining Error and Cutting Force Variation using Cylindrical Capacity Spindle Sensor on CNC Turning (CNC선삭시 주축변위센서를 이용한 편심 가공오차와 절삭력 변화특성의 검출)

  • Maeng Heeyoung;Kim Sungdong
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2005.05a
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    • pp.300-306
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    • 2005
  • This paper presents the methodology for measuring eccentricity of the machined cylindrical part using CCS(cylindrical capacitance spindle sensor) signal in the CNC turning process. We use capacitance type sensor to take full advantage of averaging effect by using large capacitance area to encompass the whole side of a sensor. The intentionally proposed initial eccentricity is applied to the experimental testpieces, and their resultant relationships between CCS orbits and eccentricities are investigated. As a result, the possibility as a automatic detection apparatus for the CNC lathe is considered based on the linearities of CCS signal and magnitude of eccentricity of machined cylindrical surfaces.

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A Study on Detection of Runout Eccentric Error Using CCS Sensor at CNC Lathe (CNC선반에서 주축변위센서를 이용한 가공편심오차의 검출에 관한 연구)

  • 양재생;맹희영
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.10a
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    • pp.468-473
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    • 2002
  • This paper presents the methodology for measuring eccentricity of the cylindricaliy machined part using CCS(Cylindrical Capacity Spindle Sensor) signal in the CNC turning process. In order to investigate the relationships between CCS orbits and eccentricities, the initial conditions for various eccentricity state and machining process is applied to the experimental strategy. AS a result, it is considered the linearities of CCS signal and magnitude of eccentricity of machined cylindrical surfaces based on the possibility as a automatic detection apparatus for the CNC lathe.

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Ultrastructures of Canine Transmissible Venereal Turner Cells at Stages of Maturation and Regression (개 전이성 생식후 종양 세포의 성숙기 및 퇴축기에 따른 미세구조)

  • Park, Nam-Yong;Rhee, Young-Hwan
    • Applied Microscopy
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    • v.17 no.1
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    • pp.169-176
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    • 1987
  • Naturally occurring canine transmissible venereal tumors of genital organs in mature and regressive stages from 6 dogs were examined by transmission electron microscope. The tumor cells at the stage of maturation were comprised of large round and ovoid cells with prominent nuclei and nucleoli, a few spindle-shaped cells, and irregularly shaped cells. The mature round cells were characterized by the presence of a central ovoid to irregularly round nucleus with a large eccentric nucleolus, vesicular endoplasmic reticulum, round to oval swollen mitochondria with few cristae, Golgi's apparatus, and plasma membranes with numerous microvilli. As the tumor degenerated, the tumor cells were increased in the number of spindle-shaped, fibroblast-like and irregularly shaped cells, collagen bundles, and mainly lymphocytes, in contrast to those of the stage of maturation. Regressing tumor cells were characterized by the swelling and vacuolation of mitochondria and endoplasmic reticulum, membrane-bound granules, lamellar complex, tubular structures, and dense bundles of collagen. It was suggested that transformation might occur in the course of tumor growth causing morphological change from the round to the fibroblast-like cells, and that there was the evidence of cell-mediated tumor cell lysis by lymphocyte infiltration.

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The Development of Hybrid Vertical Grinding System (차세대 하이브리드 수직형 복합 연삭시스템의 개발)

  • Choi, Seung Geon;Kim, Seong Hyun;Choi, Woong Kirl;Lee, Eun Sang;Choi, Ji Hun;Lee, Seok Joo;Kim, Kyu Dong
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.11
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    • pp.1139-1145
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    • 2013
  • Machine tools are the cores of industrial development in recent period. It is difficult to develop a system which can do cutting and grinding process in the one system. Hybrid Vertical Grinding System is capable of processing in a single apparatus cutting or grinding. The modal analysis and structural analysis for the development of Hybrid Vertical Grinding System is the first time of domestic work. This paper describes the technologies of Hybrid Vertical grinding machine and intend to introduce the studies in the development of the Hybrid Vertical Grinding System.

Immunofluorescence and Electron Microscopic Study on the Artificial Insemination and Rotation-Shift Behaviors of the Bipolar Spindle Fiber in U. unicinctus Egg (U. unicinctus 난자의 인공수정과 감수분열 장치의 회전-이동행위에 관한 면역형광현미경 및 전자현미경적 연구)

  • Kwon, Hyuk-Jae;Jeong, Jin-Wook;Kim, Wan-Jong;Shin, Kil-Sang
    • Applied Microscopy
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    • v.33 no.2
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    • pp.105-116
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    • 2003
  • In Vitro fertilization of U. unicinctus eggs observed by immunofluorescence and electron microscopes revealed an overview of the meiotic pattern of the tide animals. The eggs have been fertilized early at germinal vesicle stage, followed by germinal vesicle break down (GVBD), but pre-mitotic aster like structure could not be resolved by the methods employed in this work. The meiotic features, such as rotation-shift movement of spindle fibers, behavior of spermatozoonmonaster in the egg cytoplasm and active spindle fiber of the 1st polar body, have been observed. The antitubulin-FITC fluorescence show the 2nd meiotic apparatus appeared firstly parallel to the tangential line of the oolemma, proceeding the meiosis, its bipolarity is rotated and shifted towards the oolemma. The polar bodysite of the oolemma was not amorphous, but active in a sense of anti-tubulin-FITC reactions during the extrusions of the polar bodies. The immunofluorescence reactions of the spermatozoon centriole appeared at a later stage of the 2nd meiosis. During the time periods, the fertilized spermatozoon resided in the egg cytoplasm. Activating the centrioles, spermatozoon approaches towards the chromosomal materials of the 2nd oocyte. This suggests that spermatozoon centrioles initiate and play a roll to fuse male and female pronuclei.

Spray Characteristics of the Rotary Atomizer for the Slinger Combustor (슬링거 연소기의 회전형 분사장치의 분무특성 연구)

  • Choi, Hyun-Kyung;Lee, Dong-Hun;You, Gyung-Won;Choi, Seong-Man
    • Journal of ILASS-Korea
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    • v.13 no.3
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    • pp.149-155
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    • 2008
  • An experimental study was performed to understand spray characteristics of the rotary atomizer for the slinger combustor. In this fuel injection system, fuel is injected and atomized in the combustor by centrifugal forces to engine shaft. The experimental apparatus consists of a high speed rotational spindle, rotary atomizer, pressure tank and acrylic case. The droplet size and velocity were measured by PDPA (phase Doppler particle analyzer), and spray was visualized by using high speed camera and Nd:Yag laser-based flash photography. From the test results, the droplet size (SMD) is largely affected by rotational speed, mass flow rate and the number of orifice. As the experimental results, we could understand the spray characteristics of the rotary atomizer for the slinger combustor and obtain the optimum shape of the rotary atomizer which is suitable for the small gas turbine engine.

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An Ultrastructural Study on the Nerve Cell Bodies of Subesophageal Ganglion from the Cabbage Butterfly, Pieris rapae L. (배추흰나비 식도하신경절(食道下神經節)의 신경세포(神經細胞)에 관(關)한 미세구조적(微細構造的) 연구(硏究))

  • Kim, Woo-Kap;Lee, Bong-Hee
    • Applied Microscopy
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    • v.11 no.1
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    • pp.1-9
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    • 1981
  • The study on the nerve cells in the subesophageal ganglion of 5-day-old cabbage butterfly, Pieris rapae L., was performed to observe their ultrastructures and classify them on the basis of the differences in size, shape and relative distribution of cell organelles. 1. Type I neurons: These cells are neurosecretory granules ranging 100 to 300 nm in size. 2. Type II neurons: As giant neurons averaging 25 to $30{\mu}m$ in size, such as mitochondria and Golgi apparatus. 3. Type III neurons: These spindle-shaped cells range 9 to $15{\mu}m$ in width. 4. Type IV neurons: These cells have a range of diameter from 12 to $16 {\mu}m$. The cells are abundantly observed in the subesophageal ganglion. 5. Type V neurons: These cells are very small nerve cells with 4.5 to $8.0{\mu}m$ in size and have a prominent nucleus.

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