I am starting a project on my lathe which requires that I thread a 1.5X8 spindle adaptor to very accurately mount to my spindle. The suggested approach is to measure the existing spindle threads precisely using thread wires and to make a copy of this male thread very accurately to use in making the female adaptor (I guess to avoid having to keep using the spindle nose for trial fits). My machining skills are pretty limited and I want to learn (which is why I am doing this project to begin with) but I am a bit confused as to how to proceed.
It is my understanding that thread wires are used to accurately find the pitch diameter, how do I use this information to turn a copy of the spindle nose? In the past I have simply turned a rod to the major diameter of the threads I want and then threaded it to a depth that worked with my mating threads. How do I use the pitch diameter when threading?
I am adding this paragraph after the initial post because I may have answered my own question: I just realized that I am probably supposed to use the wires to periodically measure the threads I am creating on the "dummy" spindle nose and try to match that exactly to the previously measured spindle in order to get the exact depth.
It is my understanding that thread wires are used to accurately find the pitch diameter, how do I use this information to turn a copy of the spindle nose? In the past I have simply turned a rod to the major diameter of the threads I want and then threaded it to a depth that worked with my mating threads. How do I use the pitch diameter when threading?
I am adding this paragraph after the initial post because I may have answered my own question: I just realized that I am probably supposed to use the wires to periodically measure the threads I am creating on the "dummy" spindle nose and try to match that exactly to the previously measured spindle in order to get the exact depth.
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