PP Thornton (successors)

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PP Thornton (successors)

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  • #497343
    Michael Gilligan
    Participant
      @michaelgilligan61133

      I don’t use Facebook, but I stumbled across these whilst searching for something this morning: **LINK**

      https://www.facebook.com/PPThorntonsuccessors/videos/10201053960773462/

      MichaelG.

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      #3890
      Michael Gilligan
      Participant
        @michaelgilligan61133

        Some interesting short videos …

        #497351
        John Haine
        Participant
          @johnhaine32865

          Good link, thanks Michael! Now if we had a video of how they shape the profiles on their HSS blanks…

          #497365
          Michael Gilligan
          Participant
            @michaelgilligan61133
            Posted by John Haine on 23/09/2020 10:29:27:

            Good link, thanks Michael! Now if we had a video of how they shape the profiles on their HSS blanks…

            .

            The frustrating thing, John, is : I’m sure I have seen one [or at least some photos] years ago.

            They cut the HSS with a carbide profile tool, in the lathe, I believe.

            MichaelG.

            #497396
            ega
            Participant
              @ega

              I hastened to view MichaelG's linked video lest it be censored (I admit I don't feel sure about the working of the new rules).

              I suppose that the oil in the sump beneath the cutter is there to capture any grinding dust that doesn't go into the funnel?

              #497405
              Michael Gilligan
              Participant
                @michaelgilligan61133

                John,

                Thanks to the wonderful digital archive … and to my own search skills angel

                I have, at last, found what is probably the definitive article about cutter manufacture at

                PP Thornton (successors)

                .

                Horological Journal

                December 1995

                pp 416-418

                by J K Nicholson

                .

                MichaelG.

                #497415
                John Haine
                Participant
                  @johnhaine32865

                  Aha! Good stuff, I'll peruse that.

                  #497432
                  John Haine
                  Participant
                    @johnhaine32865

                    Well, that was an interesting read Michael! Not entirely clear, but it seems that they produce the cutters using in effect the "button" method to impart the required profile to the teeth, the "buttons" (or their equivalent) being made from carbide, ground to shape using diamond wheels. The "soft" 12-tooth HSS blank is turned on a form-relieving lathe after gashing, then vacuum heat treated to harden. Doesn't sound easy to reproduce at home!

                    #497436
                    Baz
                    Participant
                      @baz89810

                      John Haine if you substitute gauge plate for soft HSS and use the Ureaka form relieving attatcment it is perfectly do-able in the average workshop.

                      #497438
                      Michael Gilligan
                      Participant
                        @michaelgilligan61133
                        Posted by John Haine on 23/09/2020 17:53:09:

                        Well, that was an interesting read Michael! Not entirely clear, but it seems that they produce the cutters using in effect the "button" method to impart the required profile to the teeth, the "buttons" (or their equivalent) being made from carbide, ground to shape using diamond wheels. The "soft" 12-tooth HSS blank is turned on a form-relieving lathe after gashing, then vacuum heat treated to harden. Doesn't sound easy to reproduce at home!

                        .

                        Not forgetting the pantograph reduction, and the inspection work

                        …. suddenly, it makes the price look very reasonable

                        MichaelG.

                        #497441
                        John Haine
                        Participant
                          @johnhaine32865
                          Posted by Baz on 23/09/2020 18:02:00:

                          John Haine if you substitute gauge plate for soft HSS and use the Ureaka form relieving attatcment it is perfectly do-able in the average workshop.

                          Indeed, but in another thread people have been discussing manufacture of HSS tools on the Quorn.

                          #497454
                          Martin Kyte
                          Participant
                            @martinkyte99762
                            Posted by Michael Gilligan on 23/09/2020 18:32:18:

                            Posted by John Haine on 23/09/2020 17:53:09:

                            Well, that was an interesting read Michael! Not entirely clear, but it seems that they produce the cutters using in effect the "button" method to impart the required profile to the teeth, the "buttons" (or their equivalent) being made from carbide, ground to shape using diamond wheels. The "soft" 12-tooth HSS blank is turned on a form-relieving lathe after gashing, then vacuum heat treated to harden. Doesn't sound easy to reproduce at home!

                            .

                            Not forgetting the pantograph reduction, and the inspection work

                            …. suddenly, it makes the price look very reasonable

                            MichaelG.

                            Especially as they do a sharpening service at half the price of the cutter.

                            regards Martin

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