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나사 가공시에는 공작물의 직경에 의한 회전수 변화가 생기면 나사의 피치가 일정하게 나오지 않습니다.Remember to Do not involve any own details for instance authorized names or email addresses. Most 100 figures, markdown supported.Oops, I just understood you mentioned you were being starting AND halting involvi