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  • Lead screw question

    X axis lead screw in my Asian mill mics at .917".

    Is that actually metric? (23.29mm?)
    Len

  • #2
    What's the pitch?

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    • #3
      Yep. pitch.... no "standards" on lead screws - manf can do whatever.

      Comment


      • #4
        Oh...
        It's a 10.

        Problem is the screw is good but the nut is a joke so it's make not buy then?
        Last edited by QSIMDO; 11-18-2016, 10:30 PM.
        Len

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        • #5
          Is that 10 like in Bo Dereks or meters or Imperial?

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          • #6
            Allegedly Imperial but I never trusted it.
            Len

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            • #7
              10 what? 10 TPI?

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              • #8
                Originally posted by lakeside53 View Post
                10 what? 10 TPI?
                No.
                Just 10.....
                Len

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                • #9
                  I assume you are talking about the OD. The diameter and the pitch of a screw are almost completely independent of each other so the size of the OD is no indication of the pitch. If the pitch is metric, then it is metric. And vice-versa.

                  I suspect that the manufacturer makes the lead screws for economy sake. They probably make both English and metric lead screws for that lathe and install them depending on the intended country of use. They probably use the same stock for both and it is probably metric. I would guess 24 or 25mm. The final size is what they decided on to allow them to machine the stock down to a uniform diameter. Then they cut the thread. Or perhaps they start with a smaller diameter stock and roll the threads on them and what you see is the resulting, final OD from that process.

                  I wouldn't worry a lot about the actual OD. If you are making a nut to fit it, worry more about the pitch diameter.
                  Paul A.

                  Make it fit.
                  You can't win and there is a penalty for trying!

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                  • #10
                    Or just make an Evanut.

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                    • #11
                      1" x 10TPI is a common Acme thread: http://www.roton.com/Mating_Componen...family=7059495

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