• Title/Summary/Keyword: 고정 바이스

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A Study on Clamping Characteristics of Jaw-wedge for Automatic Jig Vise (자동 지그 바이스용 조오-웨지의 클램핑 특성 연구)

  • Jung, Si-Kyo;Maeng, Hee-Young
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.20 no.6
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    • pp.745-750
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    • 2011
  • A jig vise is a device to clamp workpiece precisely, which is widely used for various machine tools and manufacturing purpose. A new elastic structured jaw-wedge of jig vise is developed, in this paper, so as to satisfy the clamping requirement and the suppression effect of upright movement of workpiece. The advanced design parameters of jaw-wedge are derived step by step considering the stress distribution and the displacement profiles of ANSYS analysis, and it could find the optimum model which shows the uniform displacement profiles and exhibits the non-concentrated stress distribution of jaw neck. As a result, it is ascertained that an jaw-wedge developed in this study is the simple elastic structure which is effective for automatic multiple clamping purpose without the danger of shear crack or bucking of jaw.

Numerical Analysis for Machining Center Milling Education of Deformation by Vise Stress to Minimize (머시닝 센터 가공 교육 중 바이스 압축력으로 인한 형상 변형량에 관한 연구)

  • Kim, Jin-Woo;Bong, Ha-Yoon
    • Journal of Practical Engineering Education
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    • v.7 no.2
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    • pp.119-123
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    • 2015
  • ABS material is easy to process, impact resistance and heat resistance is strong. ABS material is often used as a substitute for the interior and exterior metal material for an automobile. As the demand of ABS increases, fabricating education using ABS has also been increasing its importance. As part of its education, ABS material is used in the mold fabricating part of the regional and national skills competition. At this time, the force of the vise for fixing the ABS material in the processing using the ABS material can affect the final shape after machining. However, it has not been an accurate description of the notes and instructions of working in education. Therefore, in this study, we study the impact the force of vise affect structural shape in the fabricating education using ABS material and during fabricating education of ABS material, trying to present the notes of the appropriate it.

High-Accuracy Bipolar Transresistance Amplifier (고정도 바이폴라 트랜스레지스턴스 증폭기)

  • 김동용;김종필차형우정원섭
    • Proceedings of the IEEK Conference
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    • 1998.10a
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    • pp.667-670
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    • 1998
  • Novel bipolar transresistance amplifier(TRA) for high-accuracy current-mode signal processing is described. The TRA consists of two current follower for the current inputs, a current summer for curent-differential, and a voltage follower for the voltage output. The simulation results show that the impedence of the current input and the voltage output is 0.5 $\Omega$ and the 3-dB cutoff frequency when used as a current to voltage converter extends beyond 40 MHz.

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A Design of Bipolar Transresistance Amplifiers (바이폴라 트랜스레지스턴스 증폭기 설계)

  • Cha, Hyeong-U;Im, Dong-Bin;Song, Chang-Hun
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.38 no.11
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    • pp.828-835
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    • 2001
  • Novel bipolar transresistance amplifier(TRA) and its offset-compensated TRA for high-performance current-mode signal processing are described. The TRA consist of two current follower for a current inputs, a current summer for the current-difference, a resistor for the current to voltage converter, and a voltage follower for the voltage output. The offset-compensated TRA adopts diode-connected npn and pnp transistor to reduce offset voltage in the TRA. The simulation results show that the TRA has impedance of 0.5 Ω at the input and the output terminal. The offset voltages at these terminals is 40 mV The offset-compensated TRA has the offset voltage of 1.1 mV and the impedance of 0.25 Ω. The 3-dB cutoff frequency is 40 MHz for the two TRA's when used as a current to voltage converter with unit-gain transresistance. The power dissipation is 11.25 mW.

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A Design of Fully-Differential Bipolar Current Subtracter and its Application to Current-Controlled Current Amplifier (완전-차동형 바이폴라 전류 감산기와 이를 이용한 전류-제어 전류 증폭기의 설계)

  • Cha, Hyeong-U
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.38 no.11
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    • pp.836-845
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    • 2001
  • A Novel fully-differential bipolar current subtracter(FCS) and its application to current controlled current amplifier(CCCA) for high-accuracy current-mode signal processing were designed. To obtain full-differential current output, the FCS was symmetrically composed of two current follower with low current-input impedance. The CCCA to control output current by the bias current was consisted of the subtracter and a current gain amplifier(CGA) with single-ended current output.. The simulation result shows that the FCS has current-input impedance of 5 Ω and a good linearity. The CCCA has 3-dB cutoff frequency of 20 MHz for the range over bias current 100 $\mu$A to 20 mA. The power dissipation of the FCS and CCCA are 1.8 mW and 3 mW, respectively.

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The Evaluation of RPM Change in X-Smart According to Power Source: Endodontic Wireless Electronic Motor (근관치료용 무선전기모터인 X-Smart의 전원의 종류에 따른 RPM 변화의 평가)

  • Park, Se-Hee;Jeong, Dong-Bin;Cho, Kyung-Mo;Kim, Jin-Woo
    • Journal of Dental Rehabilitation and Applied Science
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    • v.27 no.1
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    • pp.91-97
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    • 2011
  • The purpose of this study was to evaluate RPM maintenance in X-Smart according to the power supplied by the AC adapter and rechargeable battery. Five new X-Smart were used in this study. A handpiece with rubber disk which has reflective tape was mounted on the vice. To measure the RPM, a non-contact type digital tachometer was used. RPM measurements were recorded every 5 minutes to 180 minutes and repeated 3 times per motor from each power source. To evaluate a difference of the RPM changes, two-way repeated measures were performed using $SPSS^{TM}$ 14.0. All tests were conducted at the 95 percent confidence level. There was no significant difference in the RPM change between the power sources. Continuous use of X-Smart with a rechargeable battery for up to 180 minutes could be safely used as an endodontic wireless motor with a reliable RPM maintenance.