6039 Speeditwin Magneto

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  • November 18, 2019 at 5:19 pm #187441
    Buccaneer
    Participant

      US Member

      While stripping down the magneto for cleaning, after I removed the two
      coil attachment screws, I noticed quite a gap between the coil’s
      horseshoe’s laminations (that the coil sits on) and the pads on the mag
      plate. Looks like it was putting a lot of stress on the horseshoe lams.
      I don’t believe I lost any spacer, etc.
      Should I put a spacer of some sort on each side?
      Not sure what metalurgy I wouild have for spacers, that would be suitable as to not interfer
      with the Yen and Yang, or flow of electrons!

      DSCN8357

      Prepare to be boarded!

      November 18, 2019 at 6:25 pm #187455
      amuller
      Participant

        In general lamination stacks are easily distorted as they are made of thin layers loosely attached to each other. So I would look first for distortion there. If in fact the stator plate is distorted, it might be wise to use shim washers to avoid stressing it. I don’t think it would matter from an electrical point of view what you use, as it won’t be part of the magnetic circuit.

        November 18, 2019 at 8:52 pm #187475
        Buccaneer
        Participant

          US Member

          Thanks for the reply. I guess as long as the coil itself isn’t stressed it should be okay.

          Prepare to be boarded!

          November 18, 2019 at 11:41 pm #187507
          garry-in-michigan
          Participant

            Lifetime Member

            The laminations are coated with dielectric paint to hold down eddy currents (AKA Foucault’s currents) which reduce the output of high Frequency transformers (coils). Spacers may be made from iron shim stock, but should be also coated with this dielectric paint as they do become part of the magnetic envelope.

            November 19, 2019 at 8:45 am #187518
            Buccaneer
            Participant

              US Member

              Learned a new word today. I’ve heard of Ed, but never Mr. Foucault. Will have to look him up!
              The whole center of the mag plate was covered with, what looked to be a varnish substance.
              It was half gone, and now “all” gone to pretty it up.
              I was just pondering if I, or a previous owner, lost shims under the coil.
              Probably never was any, but that gap looked odd.
              Thanks.

              Prepare to be boarded!

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