• Journal of the Korean Society of Industry Convergence
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• v.3 no.1
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• pp.83-90
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• 2000

The purpose of this study is the development of CAM system which can machine and measure any shape by CNC lathe. The overall goal of the CAM system is to achieve the CNC lathe machining, from roughing through to final measuring, The hardware of the system comprises PC, CNC lathe and measuring tools. There are three steps in the CNC lathe machining and measuring, (1) geometric modeling by the shape patterns, (2) NC commands generation by the tool path compensated for tool nose radius, (3) machining and workpiece measuring on the lathe. It is developed a software package, with which we can conduct a micro CAM system in the PC without economical burden.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.04a
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• pp.438-442
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• 1997

The pupose of this study is the development of CAM system which can cut any shape by CNC lathe.. The overall goal of the CAM system is to achieve the CNC lathe machining, form roughing through to final measuring. The hardware of the system comprises PC and CNC lathe. There are three steps in the CNC lathe machining, (1) geometric modeling by the shape patterns, (2) NC commands generation by the tool path compensated for tool nose radius,(3) machining and workpiece measuring on the lathe. It is developed a software package, with which can conduct a micro CAM system in the PC without economical burden.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2001.04a
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• pp.107-112
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• 2001

Control system for cutting piston used in vehicle that is one of the 3D shape cutting using CNC lathe is presented. In order to cut the hybrid piston shape using CNC lathe, defined piston shape and change into machine code. The control software was developed for the high speed piston shape cutting. In this paper, the performance of this software was evaluated practically. As a result, the evaluated cutting precision was quantitatively compared with theoretical precision. Also the productivity and the quality by using CNC lathe with control software were evaluated those by using profiling.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2000.10a
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• pp.193-199
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• 2000

Control system for cutting piston used in vehicle that is one of the 3D shape cutting using CNC lathe is presented. In order to cut the hybrid piston shape using CNC lathe, defined piston shape and change into machine code. The control software was developed for the high speed piston shape cutting. In this paper, the performance of this software was evaluated practically. As a result, the evaluated cutting precision was quantitatively compared with theoretical precision. Also the productivity and the quality by using CNC lathe with control software were evaluated those by using profiling.

• 대한공업교육학회지
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• v.33 no.1
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• pp.92-113
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• 2008

The purpose of this study is to develop a standard for right performance assessment instrument for the practice CNC Lathe of work machine subject in technical high school. In this study, we developed the standard performance assessment instrument for the practice CNC Lathe through collecting and analyzing the standard performance assessment instrument of CNC Lathe from 13 technical high schools (11 public schools and 2 private schools). The developed standard of performance assessment instrument for the practice CNC Lathe is verified by getting proper estimation from 26 teachers in technical high schools (2 teachers from each school) who are taking charge of CNC Lathe practice, and mean value between 3.77 and 4.77 is very high in validity. The characteristics of assessment instrument developed in this study are as following. First, the standard of performance assessment instrument is redeveloped to evaluate the cognitive domain and affective domain as well as psychomotor domain of technical high school students. Second, the estimation field for practice subject is segmented for all practice processes and intends to do objective estimation which can be carried out by both teachers and students, not only teachers. Third, the developed standard of performance assessment instrument for the practice CNC Lathe has high validity and truthfulness because it is monitored by teachers who are teaching in technical high school.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.2 no.4
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• pp.11-16
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• 2003

Recently, CNC lathe is in need of higher speed for precision works. So more intensive and compact heat exchanger is necessary to cool down the heat in short time from drills and works during high speed working. In this study, to increase heat transfer coefficient per unit volume, inner groove tube is designed and compact oil cooler, 57% volume of conventional type, is manufactured. The heat transfer performance is experimented and is compared with the performance of conventional type.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.8 no.1
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• pp.45-51
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• 1999

Thermal expansion of the ball screw can directly affect the accuracy of positioning along the travel axis in the semi-closed loop type CNC Lathe. In this paper, use of MACRO variables can make the thermal displacement of the ball screw estimated. Also, the estimated displacements of the ball screw are controlled by calculating the interval of pitch error rate in the Numerical Control(NC). Under the constant operating conditions, the thermal expansion of the ball screw was measured to confirm the effectiveness of the compensation method in the CNC Lathe. By using this method the results show that the thermal displacement of the ball screw could be reduced to 20% compared with ordinary method.

• Journal of the Korean Society for Precision Engineering
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• v.13 no.4
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• pp.152-162
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• 1996

The purpose of this study is the development of a lathe which can cut any pistons of oval shape with high speed, accuracy and precision by CNC (Computer Numerical Control) method. Y axis which is the position determinating mechanism with high speed response was added to the CNC lathe and the ovality and profile was cut under the control of C-Y-Z axes at same time. In the case of ovality of .phi. 0.2mm, the productivity can be improved up to 2500rpm(Y axis:83Hz) by high speed cutting than modeling method. Since a personal computer is used, it is easy to change the shape of pistion and can be applied promptly to many types of piston shppe by only changing data files.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1993.10a
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• pp.181-186
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• 1993

Thermal expansion of ball screw in the semi-closed loop type CNC LATHE introduces positioning errors directly along the travelling the axis. In this paper the thermal displacements of the ball screw were estimated by using macro variable. The estimated displacements of the ball screw were given to the ball screw of the CNC LATHE under the constant driving conditions were measured to examine the effectiveness of the compensation method. The results showed that thermal displacements of the ball screw could be maintained less then 6 .mu.m positioning accaracy while using this compensation.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.5 no.2
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• pp.90-97
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• 1996

The purpose of this study is the development of a lathe which can cut any pistons of oval shape with high speed, accuracy and precision by CNC (Computer Numerical Control) method. Yaxis which is the mechanism of position determination with high speed response has been added to the CNC lathe and ovality and profile has been cut under the synchronous control of C-Y-Z axes. In the case of ovality of ø 0.5mm. the productivity can be improved up to 1500rpm by high speed cutting than modeling method.