Stub Mandrel in Aluminium

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Stub Mandrel in Aluminium

Home Forums Beginners questions Stub Mandrel in Aluminium

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  • #418367
    Iain Downs
    Participant
      @iaindowns78295

      I want to turn the back side of my flywheel (1 inch deep, 6 inch across) mounting it on a stub mandrel.

      It has a 22mm bore.

      I have no steel around that size, but I do have a piece of 25mm aluminium bar which could be pressed to service.

      Is that a good idea? Or is it to soft?

      Just to add a note, I then need to turn it round and finish off the first side so it needs to go on twice.

      Thanks

      Iain

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      #9748
      Iain Downs
      Participant
        @iaindowns78295

        WIll it work

        #418373
        Michael Gilligan
        Participant
          @michaelgilligan61133
          Posted by Iain Downs on 11/07/2019 18:26:00:

          I want to turn the back side of my flywheel (1 inch deep, 6 inch across) mounting it on a stub mandrel.

          It has a 22mm bore.

          I have no steel around that size, but I do have a piece of 25mm aluminium bar which could be pressed to service.

          Is that a good idea? Or is it to soft?

          Just to add a note, I then need to turn it round and finish off the first side so it needs to go on twice.

          Thanks

          Iain

          .

          If you really mean Aluminium, Iain … then yes it's probably too soft

          But if [as I suspect] it's an extruded hard alloy then it could well be O.K.

          … First test would be to see how cleanly it turns.

          MichaelG.

          #418374
          JasonB
          Moderator
            @jasonb

            Have you thought of holding it by the inside of the rim, you will get less vibration/chatter than is likely on a mandrel

            #418384
            Iain Downs
            Participant
              @iaindowns78295

              It's not pure aluminium – I had some of that a while back and it was HORRID to work.

              It turns very very nicely. Much better finish that steel or cast with more or less any tool.

              I hadn't thought of holding it by the inside of the rim. I'm not convinced that the chucks I've got extend that far.

              However, it's worth giving it a go. Chatter is a problem with my machine pretty much all the time, so no need to make it worse!

              Iain

              #418387
              JasonB
              Moderator
                @jasonb

                You should be able to do it with the jaws reversed and still have plenty of jaw in the chuck body

                #419091
                Iain Downs
                Participant
                  @iaindowns78295

                  I did as suggested and just about the other side sorted out. The wheel was about 0.1 mm off centre held in the 3 jaw on the inside.

                  After taking off the bulk of the metal this way, I reverted to the aluminium stub mandrel to finish back to more accuracy and it worked a treat.

                  More details on my build log…

                  Iain

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