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It’s just the depth from the thread divided with the square root of the amount of passes. Bit of a mouthful.Be careful for that Z conclude point. That’s the one which will make it hit the chuck if you can get it Incorrect.나사가 한바퀴 돌았을때 이동한 거리, 통상적으로 나사는 한줄 나사이기 때문에 리드가 피치�