Harrison M250

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Harrison M250

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  • #548260
    Malcolm Weightman
    Participant
      @malcolmweightman60501

      Hi all, Newbie here and hopefully I'm in the right area. I've just got hold of a Harrison M250 which was dropped off a pallet and part number 904037 (from the Harrison manual snapped) Its got a ball joint and hex on it, so not easy to make without CNC lathe and miller. I've tried looking around, but as someone new to this I cant find anything. Any suggestions welcome and many thanks if you can.

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      #28202
      Malcolm Weightman
      Participant
        @malcolmweightman60501
        #548268
        Ian Parkin
        Participant
          @ianparkin39383

          Can you post a picture of your broken bits?

          #548272
          Oldiron
          Participant
            @oldiron

            Have you tried Colchester spares ?

            regards

            #548274
            AndrewD
            Participant
              @andrewd

              Ty Googling 'ball stud bolt' if you can't find a proper replacement.

              #548275
              Chris Evans 6
              Participant
                @chrisevans6

                Welcome to the forum. With a picture we may see other ways to make things, good luck.

                #548279
                Gray62
                Participant
                  @gray62

                  To assist the OP and those with suggestions, the broken part is shown in this parts diagram it is part of the feed selector mechanism., given the relevant dimensions, thread etc, a straight forward part to make for someone with a working lathe although it may require hardening

                  harrison parts.jpg

                  #548285
                  Malcolm Weightman
                  Participant
                    @malcolmweightman60501

                    904037.jpg

                    #548286
                    Malcolm Weightman
                    Participant
                      @malcolmweightman60501

                      It took me a few minutes to work out how to post the image. Thanks for the many replies. I'll try the Colchester route and Googling the ball stud bolt option.

                      #548295
                      JasonB
                      Moderator
                        @jasonb

                        It would not be hard to make on your machine even without the feeds working. Take a bit of hex stock, turn down one end and then thread. Make a female threaded arbor to screw the part into and rough out the other end by turning then the ball can be cut with a homemade form tool or even use of the file against the rotating roughed out ball.

                        #548299
                        Gavlar
                        Participant
                          @gavlar

                          There is a harrison lathe user group

                          https://groups.io/g/HarrisonLathe/topics

                          I don't use it but do use the Boxford version and whilst you may need to wait a while for a responce, usually someone with specialist knowledge will come along and help in due course. If there is a source for spares, I suspect someone there will be able to tell you where to find it.

                          #548314
                          DC31k
                          Participant
                            @dc31k

                            Assuming it does not take any torque in use, just repair what you have. The difficult bits for which you think you need CNC are already there.

                            Drill and thread the hex part for at a size one or two less than the main stud (e.g if it is M8, tap it M6 or M5) and make up a shouldered threaded stud to go into that thread. Secure with loctite.

                            With care and a little thought, you do not even need a lathe – could be done in a drill press.

                            #548346
                            FMES
                            Participant
                              @fmes

                              Anyone know if one from an M300 would fit?

                              #548352
                              Nimble
                              Participant
                                @nimble

                                Hi Malcolm,

                                How about in line ball joints.

                                https://www.aetnascrew.com/ball-joints.html

                                Dismantle to get diameter and size required.

                                Nimble Neil.

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