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Cut my first nice thread

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Cut my first nice thread

Home › Forums › Beginners questions › Cut my first nice thread

Viewing 8 posts - 1 through 8 (of 8 total)
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  • 7 December 2016 at 20:52 #8426
    sean logie
    Participant
      @seanlogie69385
      7 December 2016 at 20:52 #270526
      sean logie
      Participant
        @seanlogie69385

        I tried aliminium for cutting my first thread but it was too gummy . So I thought I’d try stainless . Started of slow and easy and for the last two scratch passes I speeded up the lathe and it worked a treat . I took the chuck off tonight to check what tpi thread it was ,I’m a bit confused because there are two kind of half threads at either side of the full threads and I’m not sure which to count . The thread measured .50″ across and I counted 4 full threads . Am I right in saying the chuck thread is an 8tpi ?

        Sean

        7 December 2016 at 21:30 #270537
        daveb
        Participant
          @daveb17630

          Buy yourself a thread pitch gauge, combined Metric/Imperial, not expensive and takes away the guesswork. A set of Zeus tables is very useful, lot of info about threads, they last well too, I paid 50p for mine but it was over 40 years ago

          Dave.

          7 December 2016 at 22:08 #270548
          Emgee
          Participant
            @emgee

            Hi Sean, as suggested a pitch gauge would confirm the thread TPI but I would agree with you the 8TPI.

            Emgee

            8 December 2016 at 01:54 #270575
            Hopper
            Participant
              @hopper

              If you tell us what lathe you have, someone here will doubtless be able to quote you chapter and verse of the thread specs involved.

              8 December 2016 at 06:22 #270577
              sean logie
              Participant
                @seanlogie69385

                This is not a thread to size,this is pick a setting and run with it .

                Lathe is Fortis/clausing E/801 /B

                Sean

                9 December 2016 at 13:40 #270828
                Ian S C
                Participant
                  @iansc

                  Use your 6" steel rule, and if in 1/2" you count 4 threads, that would be 8 TPI.

                  Ian S C

                  9 December 2016 at 14:23 #270832
                  Michael Gilligan
                  Participant
                    @michaelgilligan61133
                    Posted by Ian S C on 09/12/2016 13:40:42:

                    Use your 6" steel rule, and if in 1/2" you count 4 threads, that would be 8 TPI.

                    .

                    But do remember that when counting the crests, or the troughs, you are starting at zero

                    … It's a bit like counting 'fence panels'

                    MichaelG.

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