Home Forums General Discussion Forum my process of repivoting

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  • #48994
    willofiam
    Moderator

      Here is a worn pivot, this clock had steel plates and had the pivot holes punched in the past because of wear, assuming the holes were not checked and burnished all the punched holes had pivots like this one

      #57251
      willofiam
      Moderator

        Mounted in the lathe with a steady rest, nip off the pivot as close to the arbor as possible, centering with the tail-stock comes later

        After grinding the surface flush, I use the tool for finding center that Bob shows in his videos, works great :D

        #57252
        willofiam
        Moderator

          Center is found, no picture but I then use the tail stock to make sure all is lined up correctly because I like to use the tail stock with a jacobs chuck to do the drilling

          After choosing the size pivot rod I want, I select a bit just at the same size as the rod (sometimes even a smidgen smaller) depending on the hardness of the steel and size of the arbor, then select a bit a size smaller than that. The first hole is at least 3 times the size of the pivot in depth, use the smallest drill bit first

          The next size is used to drill at least 1 times the pivot size in depth, this will create a stepped hole

          #57253
          willofiam
          Moderator

            Drilling complete and centered

            a quick test, looks good

            Chuck the pivot rod into the lathe to prep

            filing a slight taper I then draw the file off the end to create a rough surface ;)

            #57254
            willofiam
            Moderator

              I use a 220 grit emery paper and scrape off some of the grit

              roll the pivot in the grit, this will help secure the rod

              Nip off the rod leaving plenty for finishing :D

              Carefully tap the rod into the stepped hole with the grit, you will hear the sound of the tapping change when it is seated all the way

              #57255
              willofiam
              Moderator

                Back into the lathe for finishing

                Using a fine file, the pivot file and burnisher get your length and burnish the end, if careful the pivot surface may be o.k. but I like to burnish anyway

                Looking pretty good

                finished product (has oil and gunk on it) , thanks for listening, have fun with it and practice alot, get your own system down pat and it will not be so intimidating a job, This clock required 7 new pivots and has now been running perfectly for 2 weeks. William

                #57256
                Bob Tascione
                Moderator

                  Awesome demo William!

                  Thanks for posting this.

                  Bob

                  #57257
                  arutha
                  Participant

                    Very nice “How To” William :)
                    Paul.

                    #57258
                    daryn
                    Participant

                      Neat job , I like your steady rest :-)

                      #57259
                      bernie weishapl
                      Participant

                        Great looking job William. Well done.

                        #57260
                        willofiam
                        Moderator

                          O.K. well I messed up again, the depths I posted are incorrect, the smaller hole depth to be drilled should be 5-6 times the diameter of the pivot, and the larger final size hole would be approximately 2xs the pivot diameter in depth. William

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