Re-Pivoting

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  • April 5, 2014 at 8:17 am #48982
    chris mabbott
    Participant

      To date, I have only attempted to re-pivot once, I didn’t fare too well :(

      I have one of those little pivot machines with the index-able rotating head, but my problem is finding drill bits to fit into the plunger and through the guide hole in the index head.
      Now I have some incomplete, but still quite good sets of pivot drill bits, my problem is that they wont fit into the machine, dia is too large, even though these things are tiny..
      I’m also missing the fly wheel on this, but I’m unsure about how to make a new one to fit the smaller diameter shaft, yet fit over the larger end :?

      Any suggestions would be appreciated..

      April 5, 2014 at 9:14 am #57127
      daryn
      Participant

        Does the end of the shaft pull off ?

        April 5, 2014 at 10:29 am #57128
        willofiam
        Moderator

          Or is the pulley supposed to be on the larger portion? William

          April 5, 2014 at 11:01 am #57129
          daryn
          Participant

            Or the pulley could be in two halves that screw together???

            April 5, 2014 at 2:06 pm #57130
            chris mabbott
            Participant

              Hey guys, Eh, I don’t know 😆 Daryn, I’ll check that. William, others I’ve seen have the pulley on the narrow part, but who knows with these things?

              April 5, 2014 at 5:06 pm #57131
              Bob Tascione
              Moderator

                Hi Chris,
                Might be easier to make a new holder that will accept the normal shank size of the drills you have.
                As for the pulley…I would have to ask the same questions that Daryn asked. Is the end pressed on or does something unscrew? If or somehow pull apart? If not then could the pulley have been split or made up of two pieces?
                Enjoy,
                Bob

                April 7, 2014 at 10:35 am #57132
                david pierce
                Participant

                  Chris,
                  There is an inexpensive book available called THE ART OF REPOVITING FOR THE WATCH AND CLOCKMAKER by Robert D. Porter, CMW. The book shows how to make pivot drills on a watchmaker lathe. I bought a copy off of Ebay a few years ago and was very impressesed with his innovative solutions to the problem. He takes a pin vice and drills a hole through the shaft that fits over a stud mounted in the tool post holder. then a grinding wheel is put in the lathe and the pin vice fixtures the drill blank. With this crude setup he was able to grind a reasonably accurate drill bit. If you hunt for it on Ebay you can probably find a copy. It is well worth the price.
                  david

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