[Jewelry making - Article 00453] - Re: [Orchid] Rebuild old Foredom or buy new one?

[John Donivan]

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>     One other thing I have run into is where the brushes either do not
>     fit well, are not seated correctly, or the springs that press the
>     brushes against the armature are not doing 

    Another one I forgot about yesterday--- There are a couple of good
    posts today - look at the foot pedal is one. My first reaction to
    this problem is that the commutator is shot or off. It's not the
    armature really. The armature is the bundle of wires and steel plates
    that are the bulk of the motor. The commutator is the copper cylinder
    that the brushes go up against. The way a motor works is that the
    copper on the commutator is divided by insulation - that's the dark
    lines you see. Each of the copper sections is opposite polarity under
    power. One of two things can happen - the insulating lines can be
    filled will junk, and the brushes won't be making the proper contact
    with the polarity thing happening, or the motor will just plain short
    out and one or more of the copper sections will go dead. When one of
    those things happens then just what you describe will happen -
    intermittent speed problems. If the brush starts on a dead section,
    it will struggle, if it starts on a live section, it will run fine -
    once it gets going it will just skip over the dead part, though you
    won't have full power if you were to test it. Get some proper tool,
    like a small screwdriver or knifeblade, and clean out those dark
    lines, and also sand it around, as was suggested. It could also be
    some of the other things suggested, too, like lubrication on the
    shaft. If it is the commutator, which is a very common problem with
    motors and generators, then if cleaning out the insulators doesn't do
    it likely the motor is truly shot, and repair will cost at least as
    much as a new one. 

http://www.donivanandmaggiora.com
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