How does the numerical threading dial operate on a manual lathe?

When cutting threads on a manual lathe I know that a numerical rotating dial helps you get the exact same starting place on each pass but what do the numbers represent? Even numbers for one type thread and odd for another or what?

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One Response to “How does the numerical threading dial operate on a manual lathe?”

  1. smart guy says:

    If it’s like my lathe, it’s just a way to keep track of where you were on each path. If you enter on a “4″, enter on the “4″ on each subsequent pass.

    And before someone comes and says it… Yes, I know that depending on the thread, you can always enter on the evens or enter on the odds…. but since I don’t know what you are running, it’s safer to just enter on the same number.