Home Forums General Discussion Forum HS Collet

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  • #49274
    chris mabbott
    Participant

      Hmm, I’m posting this while feeling like a dumbass 😆
      I realized that I’ve never actually “replaced” a hairspring collet, I have installed a new one on a new HS, but I am faced with a cracked collet on an 18s.
      I’m uncertain of how to remove the pin without doing damage to the inner coil/bend? This pin has been cut so cleanly that it took me a long time to actually detect it..

      I think that installing a new one on a new spring is a lot easier 😆 but I want to change one for the experience, I don’t want to trash a perfectly sound HS.. So I’m wondering how to drive out the pin and how to actually hold the ensemble while i’m attempting it..

      All off the wall, radical and slightly crazy techniques are welcome, along with video, diagram or pictorial guide if possible 🙄

      Does anyone also have a copy of the breguet terminal charts?

      #59911
      tukat44
      Participant

        I am going to check my library for the Breguet terminal chart as I seem to recall a reference to this thing- I will let you know tomorrow if I am able to find this for you. Tukat

        #59912
        randy
        Participant

          There’s probably more than one method Chris. but from what I remember reading, you push out the old pin with a fine pin of your own. Some old hairspring tool sets came with a fine tapered pin just for this function.
          If I remember correctly, you can wedge it a bit on a balance tack for stability.

          #59913
          chris mabbott
          Participant

            Thanks gents :)

            It a pain when suddenly from full steam ahead, it’s full stop! I loathe thaat 👿

            #59914
            tukat44
            Participant

              Chris, Donald deCarle’s Practical Watch Repairing Chapter (13) on Breguet Overcoil. Pages 138-145 begins “…it is well to have in mind what the theoretically, or mathematically, correct terminal looks like… ” then it goes on to talk about Lossier and Phillips curves as they relate to the Breguet overcoil- Hope this helps.- Tukat ****Sorry Chris, this reference is for the outer coil. I think you may need something about where it goes into the collet, and this would be in the few pages before chapter thirteen. I referenced first the outer coil because the text used the same word “terminal”. Tukat

              #59915
              daryn
              Participant

                Another DeCarle book is “practical watch adjusting and springing “
                This one has a section on colleting
                Daryn,
                Plenty copies on ebay fer fifteen quid or so

                #59916
                chris mabbott
                Participant

                  Thanks guys, I forgot I have Dee’s book on springing … Duh 😆

                  The charts I’m looking for are the ones that let you overlay a HS on the display images in order to form the overcoil precisely to the various pinning points. It just takes a lot of guess work and messing around out of the equation as the most efficient forms are displayed, you just have to copy them.. These are only for Breguet OCs

                  #59917
                  willofiam
                  Moderator

                    Hey Chris. Do you have Frieds book, “The watch Repairers Manual”? page 247 shows a very handy tool for re-colleting a hairspring, here is a photo of the one I made. I made it from some brass stock and used a small plate screw and a old seconds dial, just as he mentions. I put 2 parallel flats creating a shoulder so I could clamp it in a small portable vise and it would not tip in the jaws of the vise, (hope that makes sense). To me that was the key to success , being able to hold it all securely. then using my flee passport inspection device it all became very clear 😆 @Randy wrote:

                    you push out the old pin with a fine pin of your own

                    thats what I have used also. For pushing in the new pin I ground down a pliers to make a fine point for repining (much stiffer than a tweezers) that proved to work well. As far as the inner coil I think it just has to start out and around the collet evenly, not sure though. William

                    #59918
                    chris mabbott
                    Participant

                      That’s a good question William, about the book, I’ll have to check 😆
                      Was there any particular reason he suggests using a sub dial, are the markings used for reference?

                      Thanks again my brother for being my memory backup, maybe it’s getting time to wear my name tag :D

                      #59919
                      willofiam
                      Moderator

                        @Chris Mabbott wrote:

                        Was there any particular reason he suggests using a sub dial, are the markings used for reference?

                        No Chris, If I remember correctly it was just for the white background.

                        #59920
                        willofiam
                        Moderator

                          There is no need for reference when re-colleting, except for putting the hairspring on right side up.

                          #59921
                          daryn
                          Participant

                            There’s an equation to form the terminal curve so in lines up with the start of the inner coil, I’d have to ask my brother as I can’t remember that sort of nonsense if I don’t use it regularly, I guess it’s probably more relevant to high class work such as chronometer rated timepieces,,
                            I’ll check in with him and post up what he tells me, it may not be practical every day stufI f but I think it’s definitely “on topic “
                            Daryn

                            #59922
                            daryn
                            Participant
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