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나사 가공시에는 공작물의 직경에 의한 회전수 변화가 생기면 나사의 피치가 일정하게 나오지 않습니다.The last pair of figures is your infeed angle. I question your buttress thread has any 60 degree angle on it, so make use of the angle that the thread does have. So far as I am aware, you can specify any angle a