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Dore Westbury Milling Machine

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Dore Westbury Milling Machine

Home › Forums › Help and Assistance! (Offered or Wanted) › Dore Westbury Milling Machine

Viewing 6 posts - 1 through 6 (of 6 total)
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  • 28 November 2017 at 08:07 #329483
    Ian L
    Participant
      @ianl48580

      Hi, When making a Dore Westbury MKII there was an option for the spindle to have a 3MT and no Myford thread on the spindle. Does anyone know what the diameter of through bore should be and what jaw bar diameter/thread was used for holding the chucks?

      Thanks.

      Ian

      28 November 2017 at 08:07 #33110
      Ian L
      Participant
        @ianl48580
        28 November 2017 at 08:32 #329487
        Brian Wood
        Participant
          @brianwood45127

          Hello Ian,

          I built my DW to the 3 MT specification. The through hole for drawbars is 29/64 inch diameter, I opened mine up a little over what I think the drawing would have shown as 7/16 inches.

          At the time, standard drawbars were given a 3/8 Whit thread; with metrication today's versions are more likely to be M10

          I hope that helps

          Brian

          28 November 2017 at 09:10 #329493
          Ian L
          Participant
            @ianl48580

            Hi Brian,

            Thank you for the information, very helpful.

            So I can assume the upper part of the spindle assembly came pre drilled at 7/16 diameter.

            Ian

            28 November 2017 at 13:45 #329577
            Thor 🇳🇴
            Participant
              @thor

              Hi Ian,

              I have a milling machine with a MT 3 spindle, and the drawbar for my metric tooling is M12, so 7/16" might be a bit too small.

              Thor

              28 November 2017 at 14:58 #329586
              Brian Wood
              Participant
                @brianwood45127
                Posted by Ian L on 28/11/2017 09:10:00:

                Hi Brian,

                Thank you for the information, very helpful.

                So I can assume the upper part of the spindle assembly came pre drilled at 7/16 diameter.

                Ian

                Hello again Ian,

                I built my mill over 25 years ago and I simply don't remember that diameter detail now I'm afraid. I can tell you that the upper part of the spindle was inserted into the lower part containing the MT taper and the joint was Loctited. I supported the parts with a chuck, tailstock centre and a fixed steady to centralize the joint while it set. It has never shifted since despite a lot of work, some with big drills using the gearbox to give the low speed and torque needed.

                I did open out the bore some time later with a drill and extension pieces to 29/64 to give a little more internal clearance for a brass ended knock out bar and it should stand opening up still more for an M12 drawbar thread.

                I have not had to do so though so if you are building I would also pin the joint and not just rely on the Loctite

                Regards Brian

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