• 한국기계가공학회지
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• 제15권1호
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• pp.20-25
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• 2016

Recently, the requirements for high precision and efficiency machining are gradually increased to raise international competitiveness at the industrial fields of automotive and gears. This trend had made effects on the industrial fields in Korea and which needs further studying of high accuracy and efficiency machining. This study is to investigate the effects of Jig type chuck for roundness improvement in CNC turning machining of high stage speed gear. After hobbing machining, Dimensional change before and after heat treatment was very largely generated. In order to solve this problem was to develop a jig type chuck. After the heat treatment, the operation of the chuck which was the most distinguished equipment among Jig type chuck(0.006mm), Scroll type chuck(0.05mm) and Bolt type chuck(0.04mm). Therefore, Jig type chuck was satisfied the requirement from the actual field(0.02mm).

• 건강소식
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• 제34권12호
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• pp.14-15
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• 2010

길고 긴 겨울방학을 코앞에 둔 12 월. 자녀를 둔 집안에서는 전운이 감돈다. TV와 컴퓨터 게임으로부터 자녀를 사수하고자 하는 엄마와 기어코 빠져들고야 말겠다는 아이. 팽팽한 긴장감속에 벌어지는 이 웃지 못할 전투의 승률은 언제나 아이 쪽이 높다. 엄마가 고단수의 수를 써서 막으면 아이는 집을 나가 유유히 PC 방으로 향한다. 엄마의 고단수란 결국 악을 쓰고, 무조건 '안돼!' 라는 하급수의 전략이다. 엄마와 아이의 한판승부! 올바른 전략을 알아보자.