Chester Champion, warco ZX15 drawbar

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Chester Champion, warco ZX15 drawbar

Home Forums Manual machine tools Chester Champion, warco ZX15 drawbar

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  • #806309
    martian
    Participant
      @martian

      I need to make possibly two drawbars for my Chester champion mill, I have both 3/8 W and 1/2 W threaded 3MT collet chucks.

      The thing that came with the mill has damaged threads and is clearly way too long.

      20250707_165004

      I am thinking of making something like the picture below, can someone tell me suitable dimensions X, Y & Z

      Drawbar

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      #806372
      Diogenes
      Participant
        @diogenes

        Does your mill have a slot for a drift in the side of the quill – insert the chuck(s) and reach down with a rod to touch off top and bottom of the chuck’s drawbar hole and mark it at both positions to establish ‘X’.

        ‘Y’ is whatever diameter suits the thread and is a loose fit down the hole* – 3/8″ or 10mm will do for smaller drawbars, 7/16 or 12mm bar will do for the bigger threads which are equally likely to be found in MT3 spindle tooling.

        ‘Z’ is depth to bottom of drawbar hole minus say, 20-25%.

        *I’m struggling to believe that your ZX15 will pass a 1/2″ bar through the drawbar hole  – are you sure about that measurement?

         

         

        #806378
        Nicholas Farr
        Participant
          @nicholasfarr14254

          Hi Martian, I’ve just been and looked at my Chester Champion, which is the same as the ZX15, and the drawbar is like the one in your photo. X is 265mm. with Z being 26mm, but this may depend on your your collet chucks, so you may need to measure them as Diogenes has said. The bore down the spindle on mine is 13mm clearance, so both a 12mm and a 1/2″ diameter drawbar will fit. The top section of the drawbar in your sketch, may be too long, and may possibly hit the belt guard when the quill is fully up. If the drawbar in your photo is the right diameter for one or the other, you may be able to shorten it and put an appropriate thread on it.

          Regards Nick.

          #806381
          JasonB
          Moderator
            @jasonb

            Is it just the photo that makes the ER chucks look like they both have parallel shanks? But that may explain why they go in further and therefore make the drawbar seem too long.

            #806412
            Nicholas Farr
            Participant
              @nicholasfarr14254

              Hi JasonB, I think it’s just the angle of the shot, causing an optical illusion, like this 3MT arbore below.

              001bb

              Here’s a piece of 25mm bar, which makes it look tapered.

              002bb

              Regards Nick.

              #806476
              martian
              Participant
                @martian

                Thanks Nick, very useful information.

                Jason, it’s just the angle of the photo, they are 3MT. I say the drawbar is too long because it goes all the way through the spindle and the threaded portion sticks out at the bottom. Maybe it is for some other purpose? This is one of the joys of buying second hand tools, you get mystery items and missing parts.

                 

                Many thanks Martin.

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