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Portass model s 4 jaw chuck

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Portass model s 4 jaw chuck

Home › Forums › Beginners questions › Portass model s 4 jaw chuck

Viewing 6 posts - 1 through 6 (of 6 total)
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  • 17 September 2017 at 20:24 #8871
    Chris Hollingsworth
    Participant
      @chrishollingsworth76581

      Portass 4 jaw chuck

      17 September 2017 at 20:24 #317442
      Chris Hollingsworth
      Participant
        @chrishollingsworth76581

        Anyone know where I could get a 4 jaw chuck for the portass. I’ve had a look on eBay but not sure if they will fit also what will I need to help center this thanks guys

        17 September 2017 at 20:40 #317443
        Andrew Tinsley
        Participant
          @andrewtinsley63637

          Hello Chris,

          There are plenty of small 4 jaw chucks around, but you will be lucky to find one that will fit your lathe. You will need to make up a backplate and then fit a 4 jaw chuck to it. Not too difficult, apart from cutting the internal thread to match the lathe.

          Andrew.

          17 September 2017 at 21:21 #317456
          Chris Hollingsworth
          Participant
            @chrishollingsworth76581

            Do you men cutting the bolts to fit the back plate to the lathe

            17 September 2017 at 22:28 #317465
            Andrew Tinsley
            Participant
              @andrewtinsley63637

              Hello Chris,

              I am pretty sure that the Portass lathe has a screw on chuck. I.E The chuck thread engages the thread on the mandrel nose and then screws into place. It is this thread that you will need to cut in the centre of the backplate.

              I am sure that some Portass owner will correct me if the Portass doesn't have a screw on chuck.

              Andrew.

              17 September 2017 at 22:33 #317467
              Jon Cameron
              Participant
                @joncameron26580

                As long as the thread hasn't been played with, it should have a 1" BSF thread. You'll need to buy a blank casting for the back plate and machine it in your existing chuck, or a back plate with the same thread already cut. This is then mated to the chuck with the bolts. Then dialled in to reduce run out. Have a search on you tube, but here's one you tubers take on machining a back plate, always find his videos funny and educational. Credit for video to This old Tony.

                https://youtu.be/uAQLrM1P-YQ

                Edited By Jon Cameron on 17/09/2017 22:34:16

                Edited By Jon Cameron on 17/09/2017 22:40:01

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