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Pot Core dismantling

Discussion in 'Troubleshooting and Repair' started by duke37, Sep 6, 2015.

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  1. duke37


    Jan 9, 2011
    What is the best way of taking a used pot core apart?
    I have tried the big hammer method, I have not managed to dismantle without detroying it.
    It would be nice to save the bobbin so that the number of turns can be counted.
  2. Arouse1973

    Arouse1973 Adam

    Dec 18, 2013
    Hi Trevor
    Can you show us a picture of another one?
  3. Colin Mitchell

    Colin Mitchell

    Aug 31, 2014
    Try a fine blade to cut into the glue
  4. dorke


    Jun 20, 2015
    The halves are glued together.
    The ferrite is very fragile and would break easily into fragments if "hammered" .

    I think the best way is heating the glue to its melting point and taking the halves apart(100 C or about ,with gloves or pliers-very light grip !)
    You can heat with a hot-gun,an oven,soaking in boiling water etc.
    good luck

    How would you wind a transformer/coil without knowing the core's parameters?
  5. duke37


    Jan 9, 2011
    I do not have photo equipment at present to take a picture. The pot cores I have tried to open all seem to shatter, the glue is as strong or stronger than the ferrite.

    The present one I would like to dismantle is out of a Kestral electric fencer and is used as a blocking oscillator with a germanium transistor. There is much corrosion the transistor has lost a leg and the coil is open circuit. I would like to rewind it with the same number of turns, thus I do not need to know the core's parameters. I do have an inductance meter if necessary.

    I have not tried heating, that is perhaps the way to go, the bobbins seem to be plastic, perhaps nylon, and would not take kindly to be heated to more than 150 C.

    Why do I have this obsession with mending old junk?
    mrmodify likes this.
  6. Martaine2005


    May 12, 2015
    It's normally the wife that calls it junk. We normally call it repairable and never throw anything away!!
    One mans junk is another mans gold....

    mrmodify likes this.
  7. dorke


    Jun 20, 2015
    Duke and Martin,
    We share a common disease... I have a room full of that kinda stuff. :cool:

    I think 100 C should do the work, hopefully without damaging the plastic.
    mrmodify and Martaine2005 like this.
  8. Alec_t


    Jul 7, 2015
    Only a room full? I have two rooms plus a garage full of stuff that 'will come in useful one day' :p
    mrmodify and Martaine2005 like this.
  9. debe


    Oct 15, 2011
    I dismantle small SMPS ferrite transformers to rewind. How I do it is use an old Microwave oven, put the core in the oven & heat it up until the glue softens. I usualy use a time of about 2 min lots until the halves can be separated. This is hard on the Magnetron but I am using an old oven & have plenty of spare Magnetrons.
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